British Army during World War I: Wikis


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The British Army during World War I fought the largest and most costly war in its long history.[1] Unlike the French and German Armies, its units were made up exclusively of volunteers—as opposed to conscripts—at the outset of the conflict.[2] Furthermore, the British Army was considerably smaller than its French and German counterparts.[3]

During the war, there were three distinct British Armies. The 'first' army was the small volunteer force of 400,000 soldiers, over half of which were posted overseas to garrison the British Empire. This total included the Regular Army and reservists in the Territorial Force. Together, they formed the British Expeditionary Force (BEF), which was formed for service in France and became known as the Old Contemptibles. The 'second' army was Kitchener's Army, formed from the volunteers in 1914–1915 destined to go into action at the Battle of the Somme. The 'third' was formed after the introduction of conscription in January 1916, and by the end of 1918, the army had reached its maximum strength of 4,000,000 men and could field over 70 divisions. The vast majority of the army fought in the main theatre of war on the Western Front in France and Belgium against the German Empire. Some units were engaged in Italy and Salonika against the Austro-Hungarian Empire and the Bulgarian Army, while other units fought in the Middle East, Africa and Mesopotamia—mainly against the Ottoman Empire—and one battalion fought alongside the Japanese Army in China during the Siege of Tsingtao.

The war also posed problems for the army commanders, given that prior to 1914, the largest formation any serving General in the BEF had commanded on operations was a division. The expansion of the army saw some officers promoted from brigade to corps commander in less than a year. Army commanders also had to cope with the new tactics and weapons that were developed. With the move from manoeuvre to trench warfare, both the infantry and the artillery had to learn how to work together. During an offensive, and when in defence, they learned how to combine forces to defend the front line. Later in the war, when the Machine Gun Corps and the Tank Corps were added to the order of battle, they were also included in the new tactical doctrine.

The men at the front had to struggle with supply problems; the shortage of food and disease was rife in the damp, rat-infested conditions. Along with enemy action, many troops had to contend with new diseases: trench foot, trench fever and trench nephritis. When the war ended in 1918, British Army casualties, as the result of enemy action and disease, were recorded as 673,375 dead and missing, with another 1,643,469 wounded. The rush to demobilise at the end of the war substantially decreased the strength of the army, from its peak of 4,000,000 men in 1918 to 370,000 men by 1920.



The British Army during World War I could trace its organisation to the increasing demands of imperial expansion. The framework was the voluntary system of recruitment and the regimental system, which had been defined by the Cardwell and Childers Reforms of the late 19th century. The Army had been prepared and primarily called upon for Empire matters and the ensuing colonial wars.[4] In the last years of the nineteenth century, the Army was involved in a major conflict, the Second Boer War (1899–1902), which highlighted shortcomings in the Army's tactics, leadership and administration. The Esher Report of 1904 recommended radical reform of the British army, such as the creation of an Army Council, a General Staff, the abolition of the office of Commander in Chief of the Forces, and the creation of a Chief of the General Staff.[5] The Haldane Reforms of 1907 formally created an Expeditionary Force of seven divisions, reorganised the volunteers into a new Territorial Force of fourteen cavalry brigades and fourteen infantry divisions, and changed the old militia into the Special Reserve to reinforce the expeditionary force.[6]

At the outbreak of the war in August 1914, the British regular army was a small professional force. It consisted of 247,432 regular troops organised in four Guards regiments and 68 line infantry regiments, 31 cavalry regiments, artillery and other support arms.[7] Usually, each infantry regiment had two regular battalions, one of which served at home and provided drafts and reinforcements to the other which was posted overseas, while also being prepared to be part of the Expeditionary Force. Almost half of the regular army (74 of the 157 infantry battalions and 12 of the 31 cavalry regiments) was stationed overseas in garrisons throughout the British Empire.[7] The Royal Flying Corps was part of the army until 1918, and at the outbreak of the war consisted of 84 aircraft.[7]

The regular Army was supported by the Territorial Force, and by reservists. In August 1914, there were three forms of reserves. The Army Reserve of retired soldiers was 145,350 strong. They were paid 3 Shillings and 6 pence a week (17.5 pence today) and had to attend 12 training days per year.[8] The Special Reserve had another 64,000 men and was a form of part-time soldiering, similar to the Territorial Force. A Special Reservist had an initial six months full-time training and was paid the same as a regular soldier during this period; they had three or four weeks training per year thereafter.[8] The National Reserve had some 215,000 men, and was a register maintained by Territorial Force County Associations of all those who had military experience, but who had no other reserve obligation.[7][8]

The regulars and reserves totalled, on paper, a mobilised force of almost 700,000 men, although only 150,000 men were immediately available to be formed into the British Expeditionary Force (BEF) that was sent to the continent. This consisted of six infantry divisions and one of cavalry.[7] By contrast, the French Army in 1914 mobilized 1,650,000 troops and 62 infantry divisions, while the German Army mobilized 1,850,000 troops and 87 infantry divisions.[9]

Britain, therefore, began the war with six regular and fourteen reserve divisions. During the war, a further six regular, 14 Territorial, 36 Kitchener's Army and six other divisions, including the Naval Division from the Royal Navy were formed.[10]

In 1914, each British infantry division consisted of three infantry brigades each of four battalions, with two machine guns per battalion, (24 in the division). They also had three field artillery brigades with 54 18 pounder guns, one field Howitzer brigade with 18 4.5 inch howitzers, one heavy artillery battery with four 60 pounder guns, two engineer field companies, one signals company, one cavalry squadron, one cyclist company, three field ambulances, and four Army Service Corps horse-drawn transport companies and divisional headquarters support detachments.[11][12]

The single cavalry division assigned to the BEF in 1914 consisted of 15 cavalry regiments in five brigades. They were armed with rifles, unlike their French and German counterparts, who were only armed with the shorter range carbine. The cavalry division also had a high allocation of artillery compared to foreign cavalry divisions, with 24 13-pounder guns organised into two brigades and two machine guns for each regiment. However, when dismounted, the cavalry division was the equivalent of two weakened infantry brigades with less artillery then the infantry division.[13] By 1916, there were five cavalry divisions, each of three brigades, serving in France, the 1st, 2nd, 3rd divisions in the Cavalry Corps and the 1st and 2nd Indian Cavalry Divisions in the Indian Cavalry Corps, each brigade in the Indian cavalry corps contained a British cavalry regiment.[14]

Over the course of the war, the composition of the infantry division gradually changed, and there was an increased emphasis upon providing the infantry divisions with organic fire support. By 1918, a British division consisted of three infantry brigades, each of three battalions. Each of these battalions had 36 Lewis machine guns, making a total of 324 Lewis guns in the division. Additionally, there was a divisional machine gun battalion, equipped with 64 Vickers machine guns in four companies of 16 guns each, and each brigade in the division had a mortar battery with eight Stokes Mortars.[7] The artillery also changed the composition of its batteries. At the start of the war, there were three batteries with six guns per brigade; they then moved to four batteries with four guns per brigade, and finally in 1917, to four batteries with six guns per brigade to economise on battery commanders.[12] In this way, the army would change drastically over the course of the war, reacting to the various developments, from the mobile war fought in the opening weeks of the war to the static trench warfare of 1916 and 1917. The cavalry of the expeditionary force represented 9.28 percent of the army, but by July 1918 would only represent 1.65 percent. Infantry would decrease from 64.64 percent in 1914 to 51.25 percent of the army in 1918, while the Royal Engineers would increase from 5.91 percent to 11.24 percent in 1918.[4]

British Expeditionary Force

August 1914: London volunteers await their pay at St. Martin-in-the-Fields

Under the terms of the Entente Cordiale, the British Army's role in a European war was to embark soldiers of the British Expeditionary Force (BEF), which consisted of six infantry divisions and five cavalry brigades that were arranged into two Army corps: the I Corps, under the command of Douglas Haig, and the II Corps, under command of Horace Smith-Dorrien.[15] At the outset of the conflict, the British Indian Army was called upon for assistance; and in August 1914, 20 percent of the 9,610 British officers initially sent to France were from the Indian army, while 16 percent of the 76,450 other ranks came from the British Indian Army.[15]

German Emperor Kaiser Wilhelm, who was famously dismissive of the BEF, issued an order on 19 August 1914 to "exterminate...the treacherous English and walk over General French's contemptible little army". Hence, in later years, the survivors of the regular army dubbed themselves "The Old Contemptibles". By the end of 1914—after the battles of Mons, Le Cateau, the Aisne and Ypres—the old regular British army had been effectively wiped out, although it managed to stop the German advance.[15]

In October 1914, the 7th Division arrived in France, forming the basis of the British III Corps, and the cavalry had grown into its own corps of three divisions.[7] By December 1914, the BEF had expanded, fielding five army corps divided between the First Army and the Second Army.[16] As the Regular Army's strength declined, the numbers were made up—first by the Territorial Force, then by the volunteers of Field Marshal Kitchener's, New Army.[7] By the end of August 1914, he had raised six new divisions, and by March 1915, the number of divisions had increased to 29.[7] The Territorial Force was also expanded, raising second and third line battalions and forming eight new divisions, which supplemented its peacetime strength of 14 divisions.[7] The Third Army was formed in July 1915, and with the influx of troops from Kitchener's volunteers and further reorganization, the Fourth Army and the Reserve Army, which became the Fifth Army, were formed in 1916.[7]

Recruitment and conscription

In August 1914, 300,000 men had signed up to fight, and another 450,000 joined by the end of September.[17] Recruitment remained fairly steady through 1914 and early 1915, but it fell dramatically during the later years, especially after the Somme campaign, which resulted in 360,000 casualties.[18] A prominent feature of the early months of volunteering was the formation of Pals battalions.[19] Many of these pals who had lived and worked together, joined up and trained together and were allocated to the same units. The policy of drawing recruits from amongst a local population ensured that, when the Pals battalions suffered casualties, individual towns, villages, neighbourhoods, and communities back in Britain were to suffer disproportionate losses. With the introduction of conscription in January 1916, no further Pals battalions were raised.[7] As a result, conscription for single men was introduced in January 1916, and four months later, in May 1916, it was extended to all men aged 18 to 41.[20] The Military Service Act March 1916 specified that men from the ages of 18 to 41 were liable to be called up for service in the army, unless they were married (or widowed with children) or served in one of a number of reserved occupations, which were usually industrial but which also included clergymen and teachers. This legislation did not apply to Ireland, despite its then status as part of the United Kingdom (but see Conscription Crisis of 1918).[21] By January 1916, when conscription was introduced, 2.6 million men had volunteered for service, and a further 2.3 million were conscripted before the end of the war and by the end of 1918, the army had reached its peak strength of four million men.[7]

Women also volunteered for service and served in a non-combatant role, and by the end of the war, 80,000 had volunteered.[22] They mostly served as nurses in the Queen Alexandra’s Imperial Military Nursing Service (QAIMNS), the First Aid Nursing Yeomanry (FANY), the Voluntary Aid Detachment (VAD); and from 1917, in the army when the Queen Mary's Army Auxiliary Corps (WAAC) was founded.[23] The WAAC was divided into four sections: cookery; mechanical; clerical and miscellaneous. Most stayed on the Home Front, but around 9,000 served in France.[23]


In 1914, no serving British officer of the British Expeditionary Force (BEF) had controlled a force larger than a division on active operations.[24] The first Commander in Chief of the BEF, appointed in August 1914, was Field Marshal John French.[25] His last active command had been the cavalry division in the Second Boer War.[25]

Of the two corps commanders at the beginning of the war, French had remarked in 1912, that Douglas Haig, the commander of the British I Corps, would be better suited for a position on the staff than a field command.[26] Like French, Haig was a cavalryman, and his last active command had been a brigade in the cavalry division during the Second Boer War.[27] The first commander of the British II Corps was Lieutenant General James Grierson, a noted tactician who died of a heart attack soon after arriving in France.[28] French wished to appoint Lieutenant General Herbert Plumer in his place, but against French's wishes, Kitchener instead appointed Lieutenant General Horace Smith-Dorrien, who had begun his military career in the Zulu War in 1879 and was one of only five officers to survive the battle of Isandlwana.[29] He had built a formidable reputation as an infantry commander during the Sudan Campaign and the Second Boer War.[30] After the Second Boer war, he was responsible for a number of reforms, notably forcing an increase in dismounted training for the cavalry. This was met with hostility by French (as a cavalryman), and by 1914, French's dislike for Smith-Dorrien was well known within the army.[31]

French was eventually replaced in 1915, by Haig, who commanded the BEF for the remainder of the war. He became most famous for his role as its commander during the battle of the Somme, the battle of Passchendaele, and the Hundred Days Offensive—the series of victories leading to the German surrender in 1918.[32] Haig was succeeded in command of the First Army by General Charles Carmichael Monro, who in turn, was succeeded, in September 1916, by General Henry Horne, the only officer with an artillery background to command a British army during the war.[33]

General Plumer eventually was appointed to command II Corps, in December 1914, and he succeeded Smith-Dorrien in command of the Second Army in 1915.[34] He had commanded a mounted infantry detachment in the Second Boer war, where he started to build his reputation. He held command of the Ypres salient for three years, and he gained an overwhelming victory over the German Army at the battle of Messines in 1917. Plumer is generally recognised as one of the most effective of the senior British commanders on the Western Front.[34]

Sir Douglas Haig with his army commanders and their chiefs of staff, November 1918. Front row,left to right: Herbert Plumer, Haig, Rawlinson. Middle row,left to right: Byng, Birdwood, Horne. Back row,left to right: Lawrence, Kavanagh, White, Percy, Vaughan, Montgomery, Anderson.

General Edmund Allenby commanded the Third Army on the western front. He had previously served in the Zulu War, the Sudan campaign, and the Second Boer war; and he was commander of the cavalry division on the western front, where his leadership was noted during the retreat from Mons and the first battle of Ypres.[35][36][37] In 1917, he was given command of the Egyptian Expeditionary Force, where he oversaw the conquest of Palestine and Syria in 1917 and 1918.[38] Allenby replaced Archibald Murray, who had been the Chief of Staff of the British Expeditionary Force in France in 1914.[28]

Allenby was replaced as Third Army commander by General Julian Byng, who began the war as commander of the 3rd Cavalry Division. After performing well during the First Battle of Ypres, he was given command of the Cavalry Corps. He was sent to the Dardenelles in August 1915, to command the British IX Corps. Byng planned the highly successful evacuation of 105,000 Allied troops and the majority of the equipment of the Mediterranean Expeditionary Force (MEF). The withdrawal was successfully completed in January 1916, without the loss of a single man.[39] Byng had already returned to the western front, where he was given command of the Canadian Corps. His most notable battle was the battle of Vimy ridge in April 1917, which was carried out by the Canadian Corps with British support.[39]

General Henry Rawlinson served on Kitchener's staff during the advance on Omdurman, in 1898, and served with distinction in the Second Boer War, where he earned a reputation as one of the most able British commanders.[40] Rawlinson took command of the British IV Corps in 1915, and then command of the Fourth Army in 1916, as the plans for the Allied offensive on the Somme were being developed.[40] During the war, Rawlinson was noted for his willingness to use innovative tactics, which he employed during the battle of Amiens, where he combined attacks by tanks with artillery.[41]

General Hubert Gough commanded a mounted infantry regiment with distinction during the relief of Ladysmith, but then, his command was destroyed while attacking a larger Boer force in 1901.[42] When he joined the BEF, he was in command of the 3rd Cavalry Brigade, and was promoted from a brigade to a corps command in less than a year. In September 1914, he was given command of the 2nd Cavalry Division; in April 1915, the 7th Division; and in July 1915, the British I Corps which he commanded during the battle of Loos.[43] In May 1916, he was appointed commander of the Fifth Army, which suffered heavy losses in the battle of Passchendaele.[43] The collapse of the Fifth Army was widely viewed as the reason for the German breakthrough in the Spring Offensive, and Gough was dismissed as its commander in March 1918,[43] being succeeded by General William Birdwood for the last months of the war. Birdwood had previously commanded the Australian Corps, an appointment requiring a combination of tact and tactical flair.[44]

On the Macedonian front, General George Milne commanded the British Salonika Army,[45] and General Ian Hamilton commanded the ill-fated MEF during the Gallipoli Campaign.[46] He had previously seen service in the First Boer War, the Sudan campaign, and the Second Boer War.[47]

Back in Britain, the professional commander of the British Army, or Chief of the Imperial General Staff (CIGS), was General James Murray, who retained that post during the early years of the war.[48] He was replaced as CIGS, in 1916, by General William Robertson.[49] A strong supporter of Haig, Robertson was replaced, in 1918, by General Henry Hughes Wilson.[50]


Officer selection

In August 1914, there were 28,060 officers in the British Army, of which 12,738 were regular officers, while the rest were in the reserves.[51] The number of officers in the army had increased to 164,255 by November 1918. These were survivors among the 247,061 officers who had been granted a commission during the war.[52]

Most pre-war officers came from families with military connections, the gentry or the peerage; a public school education was almost essential.[53] In 1913, about two percent of regular officers had been promoted from the ranks.[54] The officer corps, during the war, consisted of regular officers from the peacetime army, officers who had been granted permanent commissions during the war, officers who had been granted temporary commissions for the duration of the war, territorial army officers commissioned during peacetime, officers commissioned from the ranks of the pre-war regular and territorial army, and temporary officers commissioned from the ranks for the duration of the war alone.[55]

In September 1914, Lord Kitchener announced that he was looking for volunteers and regular NCOs to provide officers for the expanding army.[55] Most of the volunteers came from the middle class, with the largest group from commercial and clerical occupations (27 percent), followed by teachers and students (18 percent) and professional men (15 percent).[56] In March 1915, it was discovered that 12,290 men serving in the ranks had been members of a university or public school Officers' Training Corps (OTC). Most applied for, and were granted, commissions, while others who did not apply were also commissioned.[57] At the end of 1915, the army introduced a new system for recruiting officers that guaranteed that the vast majority had served in the ranks.[58]

Once a candidate was selected as an officer, promotion could be rapid. A. S. Smeltzer, after serving in the Regular Army for 15 years, was commissioned as a Second Lieutenant in 1915. He rose in rank, and by the Spring of 1917, he had been promoted to Lieutenant Colonel and was commanding officer of the 6th Battalion, The Buffs (Royal East Kent Regiment).[59]

Along with rapid promotion, the war also noticeably lowered the age of battalion commanding officers. In 1914, they were aged over 50, while the average age for a battalion commanding officer in the BEF, between 1917 and 1918, was 28.[60] By this stage, it was official policy that men over 35 were no longer eligible to command battalions.[61] This trend was reflected amongst the junior officers. Anthony Eden was the Adjutant of a battalion when aged 18, and served as the Brigade Major in the 198th Brigade while still only aged 20.[62]

The war also provided opportunities for advancement onto the General Staff, especially in the early days of the war, when many former senior officers were recalled from retirement. Some of these were found wanting, due to their advanced age, their unwillingness to serve, or a lack of competence and fitness; and most were sent back into retirement before the first year of the war was over, leaving a gap that had to be filled by lower-ranking officers.[39] Criticism of the quality of staff work in the Crimean War and the Second Boer War had led to sweeping changes under Haldane. The Staff College, Camberley was greatly expanded and Lord Kitchener established another staff college at Quetta in 1904. Nonetheless, when war broke out in August 1914, there were barely enough graduates to staff the BEF. Short four-month staff courses were introduced, and filled with regimental officers who, upon completing their training, were posted to various headquarters. As a result, staff work was again poor, until training and experience slowly remedied the situation. In 1918, staff officers who had been trained exclusively for static trench warfare were forced to adapt to the demands of semi-open warfare.[63]

During the course of the war, 78 British and Dominion officers of the rank of Brigadier-General and above were killed or died during active service, while another 146 were wounded, gassed, or captured.[64]


British official historian Brigadier James Edward Edmonds recorded in 1925, that "The British Army of 1914, was the best trained best equipped and best organized British Army ever sent to war".[65] This was in part due to the Haldane reforms, and the Army itself recognising the need for change and training. Training began with individual training in winter, followed by squadron, company or battery training in spring; regimental, battalion and brigade training in summer; and division or inter-divisional exercises and army manoeuvres in late summer and autumn.[66] The common doctrine of headquarters at all levels was outlined in the Field Service Pocket Book, which Haig had introduced while serving as Director of Staff Studies at the War Office in 1906.

The Second Boer War had alerted the army to the dangers posed by fire zones that were covered by long-range, magazine-fed rifles.[66] In the place of volley firing and frontal attacks, there was a greater emphasis on advancing in extended order, the use of available cover, the use of artillery to support the attack, flank and converging attacks, and fire and movement.[66] The Army expected units to advance as far as possible in a firing line without opening fire, both to conceal their positions and conserve ammunition, then to attack in successive waves, closing with the enemy in a decisive attack.[66]

The cavalry practised reconnaissance and fighting dismounted more regularly, and in January 1910, the decision was made at the General Staff Conference that dismounted cavalry should be taught infantry tactics in attack and defence.[67] They were the only cavalry from a major European power trained for both the mounted cavalry charge and dismounted action, and equipped with the same rifles as the infantry, rather than short-range carbines.[68] The cavalry were also issued with entrenching tools prior to the outbreak of war, as a result of experience gained during the Second Boer War.[68]

The infantry's marksmanship, and fire and movement techniques, had been inspired by Boer tactics and was established as formal doctrine by Colonel Charles Monro when he was in charge of the School of Musketry at Shorncliffe. In 1914, British rifle fire was so effective that the Germans believed they were facing huge numbers of machine guns.[69] The Army concentrated on rifle practice, with days spent at the rifle ranges dedicated to improving marksmanship and obtaining a rate of fire of 15 rounds a minute at 300 yards (270 m); one sergeant set the record of 38 rounds into a 12 inches (300 mm) target set at 300 yards (270 m) in 30 seconds.[70] In their 1914 skill-at-arms meeting, the 1st Battalion Black Watch recorded 184 marksmen, 263 first-class shots, 89 second-class shots, and four third-class shots, at ranges from 300 yards out to 600 yards (550 m).[71] The infantry also practised squad and section attacks, and fire from cover, often without orders from officers or NCO's, so that soldiers would be able to act on their own initiative.[72] In the last exercise before the war, it was noted that the infantry made wonderful use of ground advances in short rushes and always at the double and almost invariably fires from a prone position.[72]


The British Army was armed with the Short Magazine Lee-Enfield Mk III (SMLE Mk III), which featured a bolt-action and large magazine capacity that enabled a trained rifleman to fire 20 to 30 aimed rounds a minute.[70] World War I accounts tell of British troops repelling German attackers, who subsequently reported that they had encountered machine guns, when in fact, it was simply a group of trained riflemen armed with SMLE Mk III rifles.[73] The heavy Vickers machine gun proved itself to be the most reliable weapon on the battlefield, with some of its feats of endurance entering military mythology.[74] One account tells of the action by the 100th Company of the Machine Gun Corps at High Wood on 24 August 1916. This company had 10 Vickers guns, and it was ordered to give sustained covering fire for 12 hours onto a selected area 2,000 yards (1,800 m) away, in order to prevent German troops forming up there for a counter attack while a British attack was in progress. Two companies of infantry were allocated as ammunition carriers, supplying rations and water for the machine gunners. Two men worked a belt–filling machine non–stop for 12 hours, keeping up a supply of 250–round belts. They used up 100 new barrels, and all of the water—including the men’s drinking water and the contents of the latrine buckets—was also used to keep the guns cool. In that 12–hour period the 10 guns fired just short of one–million rounds between them. One team is reported to have fired 120,000 from their gun. At the close of the operation, it is alleged that every gun was working perfectly and that not one gun had broken down during the whole period.[74]

The lighter Lewis gun was adopted for land and aircraft use in October 1915.[75] The Lewis gun also had the advantage of being about 80-percent faster—in both time and component parts—to build than the Vickers gun had been; and it was far more portable.[76] By the end of World War I, over 50,000 Lewis Guns had been produced, and they were nearly ubiquitous on the Western Front, outnumbering the Vickers gun by a ratio of about 3:1.[77]

The Stokes Mortar was rapidly developed when it became clear that some type of weapon was needed to provide artillery-like fire support to the infantry.[78] The weapon was fully man-transportable yet also capable of firing reasonably powerful shells at targets beyond the range of rifle grenades.[78]

Finally, the Mark I tank, a British invention, was seen as the solution to the stalemate of trench warfare.[79] The Mark I tank had a range of 23 miles (37 km), without refuelling, and a speed of three miles per hour; the Mark I tank first saw service on the Somme in September 1916.[80][81]

Infantry tactics

British infantry advancing in support during the battle of Morval, 25 September 1916, part of the battle of the Somme, the different waves and the distance between them can be seen

After the race to the sea, manoeuvre warfare gave way to trench warfare, a development for which the British Army had not prepared. Expecting an offensive mobile war, the Army had not instructed the troops in defensive tactics and had failed to obtain stocks of barbed wire, hand grenades, or trench mortars.[82] In the early years of trench warfare, the normal infantry attack formation was based on the battalion, which comprised four companies that were each made up of four platoons.[83] The battalion would form 10 waves with 100 yards (91 m) between each wave, while each company formed two waves of two platoons. The first six waves were the fighting waves from three of the battalions companies, and the seventh wave contained the battalion headquarters; the remaining company formed the eighth and ninth waves, which were carrying waves expected to carry equipment forward, and the tenth wave contained the stretcher bearers and medics.[83] The formation was expected to move forward at the rate of 100 yards (91 m) every two minutes, even though each man carried his rifle, bayonet, gas mask, ammunition, two hand grenades, wire cutters, a spade, two empty sandbags and flares.[83] The carrying platoons, in addition to the above, also carried extra ammunition, barbed wire and construction materials to effect repairs to captured lines and fortifications.[83]

By 1918, experience had led to a change in tactics; the infantry no longer advanced in rigid lines, but formed a series of flexible waves.[84] They would move covertly, under the cover of darkness, and occupy shell holes or other cover near to the German line. Skirmishers formed the first wave and followed the creeping barrage into the German front line to hunt out points of resistance. The second or main wave followed in platoons or sections in single file. The third was formed from small groups of reinforcements, and the fourth wave was expected to defend the captured territory.[84] All waves were expected to take advantage of the ground during the advance.[84] (see below for when operating with tanks)

Each platoon now had a Lewis gun section and a section that specialised in throwing hand grenades, and each section was compelled to provide two scouts to carry out reconnaissance duties.[85] Each platoon was expected to provide mutual fire support in the attack they were to advance, without halting; but leap frogging was accepted, with the lead platoon taking an objective and the following platoons passing through them and onto the next objective, while the Lewis gunners provided fire support.[85] Grenades were used for clearing trenches, and each battalion carried forward two trench mortars to provide fire support.[85]

Tank tactics

The tank was designed to break the deadlock of trench warfare.[79] In their first use in the Somme, they were placed under command of the infantry and ordered to attack their given targets in groups or pairs. They were also assigned small groups of troops, who served as an escort while providing close defence against enemy attacks.[81] Only nine tanks reached the German lines to engage machine gun emplacements and troop concentrations. On the way, 14 broke down or were ditched, and another 10 were damaged by enemy fire.[81] In 1917, during the battle of Cambrai, the Tank Corps adopted new tactics. Three tanks working together would advance in a triangle formation, with the two rear tanks providing cover for an infantry platoon.[81] The tanks were to create gaps in the barbed wire for the trailing infantry to pass through, then use their armament to suppress the German strong points.[86] The effectiveness of tank–infantry cooperation was demonstrated during the battle, when Major General George Montague Harper of the 51st (Highland) Division refused to cooperate with the tanks, a decision that compelled them to move forward without any infantry support; the result was the destruction of more than a dozen tanks by German artillery sighted behind bunkers.[87] The situation had changed again by 1918, when tank attacks would have one tank every 100 yards (91 m) or 200 yards (180 m), with a tank company of 12 to 16 tanks per objective. One section of each company would be out in front, with the remainder of the company following behind and each tank providing protection for an infantry platoon, who were instructed to advance making use of available cover and supported by machine gun fire.[88] When the tanks came across an enemy strong point, they would engage the defenders, forcing them into shelter and leaving them to the devices of the trailing infantry.[88]

Artillery tactics

8 inch howitzers of the 39th Siege Battery, Royal Garrison Artillery conducting a shoot in the Fricourt-Mametz valley, August 1916, during the battle of the Somme.

The artillery, prior to the war, no longer worked independently and was taught to support the infantry to ensure a successful attack.[66] In 1914, the heaviest artillery gun was the 60-pounder gun, four in each of the heavy batteries. The Royal Horse Artillery employed the 13-pounder gun, while the Royal Field Artillery used the 18-pounder gun. By 1918, the situation had changed, and members of the artillery were the dominant force on the battlefield. Between 1914 and 1918, the Royal Field Artillery had increased from 45 field brigades to 173 field brigades,[89] while the heavy and siege artillery of the Royal Garrison Artillery had increased from 32 heavy and six siege batteries to 117 heavy and 401 siege batteries.[90] With this increase in the number of batteries of heavier guns, the armies needed to find a more efficient method of moving the heavier guns around. (It was proving difficult to find the number of draught horses required.) The War office ordered over 1,000 Holts Caterpillar tractors, which transformed the mobility of the siege artillery.[91] The army also mounted a variety of surplus naval guns on various railway platforms to provide mobile long-range heavy artillery on the Western Front.[92]

Until 1914, artillery generally fired over open sights at visible targets, and the largest unit accustomed to firing at a single target was the artillery regiment or brigade.[93] One innovation brought about by the adoption of trench warfare was the barrage—a term first used in orders for the battle of Neuve Chapelle in 1915.[93] Trench warfare had created the need for indirect fire, with the use of observers, more sophisticated artillery fire plans, and an increasingly scientific approach to gunnery, where artillerymen had to use increasingly complicated calculations to lay the guns. Individual guns were aimed so that their fall of shot was coordinated with others to form a pattern; in the case of a barrage, the pattern was a line.[93]

The creeping barrage was a barrage that lifted in small increments, perhaps 50 yards (46 m), so that it moved forward slowly, keeping pace with the infantry,[94] who were trained to follow close behind the moving wall of their own fire, often as close as 55 yards (50 m); infantry commanders were encouraged to keep their troops as close to the barrage as possible, even at the risk of casualties from friendly fire.[95][96] A creeping barrage could maintain the element of surprise, with guns opening fire only shortly before the assault troops moved off. It was useful when enemy positions had not been thoroughly reconnoitred, as it did not depend on identifying individual targets in advance.[97] The idea behind the creeping barrage was that the infantry should reach the enemy positions before the defenders had time to recover, emerge from shelters, and man their firing positions.[97] On the first day of the battle of the Somme, the barrage outpaced the infantry, allowing the defenders to recover and emerge from their dugouts, with disastrous results for the attackers.[98] The creeping barrage demonstrated its effectiveness a year later, in 1917, during the battle of Arras.[99] A weakness of the creeping barrage was that the infantry was subordinated to the artillery schedule, while the infantry commanders had less control over the tactical situation and were therefore in danger of forgetting how to manoeuvre their troops around the battlefield.[95] The importance of the barrage was such that traditional infantry tactics, including a reliance on the infantry's own fire power to support its movement forward, was sometimes forgotten.[100]

Once the infantry had reached the German trenches, the artillery shifted from the creeping barrage to the standing barrage, a static barrage that would protect the infantry from counter attacks while they consolidated the position. A variant was the box barrage, in which three or four barrages formed a box—or more often three sides of a box—around a position to isolate and prevent reinforcements being brought up into the front line. This was normally used to protect trench raids,[101] although it could also be used offensively against a German unit. Another type of barrage was the SOS barrage, fired in response to a German counter attack. An SOS barrage could be brought down by firing a flare signal of a pre arranged colour, as a German barrage tended to cut the telephone lines. A pre registered barrage would then descend on No Man's Land.[102]

With the introduction of the Tank the artillery was no longer required to aid the infantry by destroying obstacles and machine gun positions. Instead, the artillery assisted by neutralising the German artillery with Counter battery fire.[103] British Army researchers under Lieutenant William Lawrence Bragg developed sound ranging, a method of determining the location of a hostile artillery from the sound of its guns firing.[104] A Counter Battery Staff Officer (CBSO) was appointed at each corps to coordinate the counter battery effort, collating reports from sound ranging and Royal Flying Corps observers.[105] By the end of the war it was realised that the important effect of the barrage was to demoralise and suppress the enemy, rather than physical destruction; a short, intense bombardment immediately followed by an infantry assault was more effective than the weeks of grinding bombardment used in 1916.[98]


The Royal Engineers Signal Service, formed in 1912, was given responsibility for communications that included signal dispatch, telegraph, telephone and later wireless communications, from army headquarters to brigade and down to battery level for the artillery.[106] For most of the war, the Army's primary methods of communication were signal dispatch (employing runners, messengers on horseback, dogs, and carrier pigeons), visual signalling, telegraph, and telephone.[106] At the start of the war, the Army had a small number of wireless sets, which—in addition to being heavy and unreliable—operated on longwave. In 1915, trench wireless sets were introduced, but the transmissions were easily intercepted by the listening Germans.[106]

Civilian telephones were used at the outset of the war, but they were found to be unreliable in the damp, muddy conditions that prevailed. Consequently, the field telephone was designed: a device that operated with its own switchboard. Apart from voice communication, it featured a buzzer unit with a Morse code key, so that it could be used to send and receive coded messages. This facility proved useful when, in the midst of bombardment, exploding shells drowned out voice communication. The telephones were connected by telephone lines that sustained continual damage as a result of shell fire and the movement of troops. The lines were generally buried, with redundant lines set in place to compensate for breakages.[106]

The primary types of visual signalling were Semaphore flags, lamps and flags, lamps and lights, and the heliograph. In open warfare, visual signalling (employing signal flags and the heliograph) was the norm. A competent signaller could transmit 12 words a minute with signal flags (during daylight) and signal lights (at night). Signal lights, which were secured in a wooden case, employed a battery-operated Morse code key.[106] These signalling techniques had certain disadvantages, however. In trench warfare, operators using these methods were forced to expose themselves to enemy fire; and while messages sent to the rear by signal lights could not be seen by enemy forces, replies to such messages were readily spotted, and operators were, once again, exposed to enemy fire.[106]

During the war, the Army also trained animals for use in the trenches. Dogs were trained to carry messages; and horses, mules, and dogs were used to lay telephone and telegraph cables.[106] Carrier pigeons, who transported messages back from the front line, were also carried along in tanks so that they could deliver messages during an attack.[106] Over 20,0000 pigeons and 370 handlers were used during the war, and at times, they were the sole means of communication.[106]

Royal Flying Corps

Royal Flying Corps World War I recruiting poster

At the start of the war, the Royal Flying Corps (RFC) in the Field, commanded by Sir David Henderson consisted of five squadrons—one observation balloon squadron (RFC No 1 Squadron) and four aeroplane squadrons (RFC No 2, No 3, No 4 and No 5 Squadrons).[107] These squadrons were first used for aerial spotting on 13 September 1914, but only became efficient when they perfected the use of wireless communication at Aubers ridge on 9 May 1915. Aerial photography was attempted during 1914, but once again, it only became effective the following year. In August 1915, General Hugh Trenchard replaced Henderson. The British use of air power evolved during the war, from a reconnaissance force to a fighting force that attempted to gain command of the air above the trenches and carry out bombing raids on targets behind the line.[108] The early aircraft of the RFC were inferior to their German rivals; in April 1917, (Bloody April) the RFC lost over 300 aircrew and 245 aircraft.[109] Not until late 1917, with the introduction of the Sopwith Camel and the S.E.5, were they able to compete successfully for control of the air.[108]

On 17 August 1917, General Jan Smuts presented a report to the War Council concerning the future of air power. Given its potential for the 'devastation of enemy lands and the destruction of industrial and populous centres on a vast scale', he recommended a new air service be formed that would be on a level with the Army and Royal Navy. The formation of the new service, however, would make the under utilised men and machines of the Royal Naval Air Service (RNAS) available for action across the Western Front, as well as ending the inter-service rivalries that at times had adversely affected aircraft procurement. On 1 April 1918, the RFC and the RNAS were amalgamated to form a new service, the Royal Air Force (RAF). The RAF was under the control of the new Air Ministry. By 1918, photographic images could be taken from 15,000 feet and interpreted by over 3,000 personnel. Planes did not carry parachutes until 1918, though they had been available since before the war.[110] After starting in 1914 with some 2,073 personnel, the RAF had 4,000 combat aircraft and 114,000 personnel by the beginning of 1919 .[111]

Corps of Royal Engineers

On 1 August 1914, the Royal Engineers consisted of 25,000 officers and men in the regular army and reserves; by the same date in 1917, it had grown to a total manpower of 250,000.[112] In 1914, when the BEF arrived in France, there were two Engineer field companies attached to each infantry division, which was increased to three companies by September 1914.[113] Each division also had a Signals company, which was responsible for communications between Corps, Division and Brigade headquarters. [114] The Engineer Tunnelling Companies were formed in response to the German blowing of 10 small mines in December 1914, at Givenchy.[115] The first British mine was blown at Hill 60 on 17 February 1915. Mining was used increasingly during the battle of Aubers ridge in May 1915, and the battle of Loos in September 1915; and in July 1916, on the first day of the battle of the Somme, what became known as the Lochnagar Crater was created by a blown mine at La Boisselle.[115] Twenty-one companies were eventually formed and were employed digging subways, cable trenches, Sapping, dugouts as well as offensive or defensive mining.[115] At the end of the war, the Engineer's were directly responsible for maintaining buildings and designing the infantry front-line fortifications and artillery positions, the telephones, wireless and other signalling equipment, railways, roads, water supply, bridges and transport; they also operated the railways and inland waterways.[112]

Machine Gun Corps

In September 1915, the Machine Gun Corps (MGC) was formed to provide heavy machine-gun teams, after a definite proposal was made to the War Office for the formation of a single specialist machine-gun company for each infantry brigade—a goal to be achieved by withdrawing guns and gun teams from the battalions.[116] Created in October 1915, the MGC consisted of infantry machine-gun companies, cavalry machine-gun squadrons, and motor machine-gun batteries.[116] In the trenches, the Corps' guns were deployed with an interlocking field of fire and proved to be a devastating defensive weapon against attacking infantry.[116] They were also used in an indirect fire support role, in which they fired over the heads,[116] and from the flanks,[117] of the advancing infantry and behind the German trenches, to stop reinforcements and supplies from getting to the front.[116]

Tank Corps

The Tank Corps, formed as the Heavy Section Machine Gun Corps in 1916,[118] tanks were used for the first time in action in the battle of the Somme on 15 September 1916, the intention was they would crush the barbed wire for the infantry then cross the trenches and exploit any breakthrough behind the German lines.[119] In November 1916, they were renamed the Heavy Branch M.G.C. and in June 1917, the Tank Corps.[120]

Originally formed in Companies of the Heavy Branch MGC, designated the companies as A, B, C and D, each company of four sections has six tanks three male and three female versions, with one tank held as a company reserve.[121] In November 1916, each company was reformed as a battalion of three companies, with plans to increase the Corps to 20 battalions, each Tank Battalion had a complement of 32 officers and 374 men.[121]

In the first mass tank attack of the war at the battle of Cambrai, 476 tanks started the attack, the German front collapsed and by midday the British had penetrated five miles behind the German line.[122] By the battle of Amiens the value of the tank was appreciated and ten heavy and two light battalions of 414 tanks were included for the assault, 342 Tank Mark V's and 72 Whippet tanks they were backed up by a force of 120 tanks designed to carry forward supplies for the tanks and infantry, by the end of the first day the attack had penetrated the German line by six to eight miles and 16,000 prisoners had been captured.[123] By September 1918, the British Army was the most mechanized army in the world. Some 22,000 men had served in the Tank Corps by the end of the war.[124]

Army Service Corps

The Army Service Corps (ASC) operated the transport system to deliver men, ammunition and materials to the front. From 12,000 men at the start of the war the Corps increased in size to over 3,000,000 by November 1918.[125] In addition they had under command Indian, Egyptian, Chinese (Chinese Labour Corps) and other native labourers, carriers and stores men.[125] They provided horsed transport companies, mechanical transport companies, the army remounts service and ASC Labour companies.[125] In August 1914, they delivered 4,500,000 pounds of bread, to the front which had increased to 90,000,000 pounds by November 1918.[125]

Royal Army Medical Corps

The Royal Army Medical Corps (RAMC) supplied the doctors, casualty evacuation, field ambulances and hospitals for the army.[126] The Corps was assisted in its work by voluntary help from the British Red Cross, St John's Ambulance and the Friends Ambulance Unit.[126] The only person to be awarded the Victoria Cross twice during the war was a doctor in the RAMC, Captain Noel Godfrey Chavasse, VC and Bar, MC.[127] While not strictly a member of the RAMC, stretcher bearer Lance Corporal William Harold Coltman VC, DCM & Bar, MM & Bar, was the most decorated other rank of the war.[128]

Life in the trenches

Trench construction diagram from a 1914 British infantry manual

By the end of 1914 the war on the Western Front had reached stalemate and the trench lines extended from the Belgian coast to the Swiss frontier.[129] By September 1915, the length of the British front line stretched for some 70 miles (110 km). Soldiers were in the front or reserve line trenches for about eight days at a time, before being relieved.[129]

There were three trenches in the front line; the fire trench, the support trench and the reserve trench, all being joined by communication trenches.[130] The trenches varied in depth, but they were usually about four or five feet deep, or in areas with a high water table they built a wall of sandbags to allow the defenders to stand upright, the fire trenches were provided with a fire step, so the occupants could return fire during an attack (see diagram).[130] Ideally the bottom of the trench was lined with duckboards to prevent men from sinking into the mud and dugouts were cut into the walls for living in, these gave shelter from the elements and shrapnel, but in the British Army dugouts were usually reserved for the officers and the senior NCO's.[130] The men were then expected to sleep wherever they could and in wet weather they lived under ground sheets or in tents on the bottom of the trench on the duckboards.[130]

At the front soldiers were in constant danger from artillery shells, mortars and bullets and as the war progressed they also faced aerial attack.[131] Some sectors of the front saw little activity throughout the war, making life in the trenches comparatively easy. Other sectors were in a perpetual state of violent activity. However, quiet sectors still amassed daily casualties through sniper fire, artillery fire and disease, the harsh conditions, often wet and muddy and the constant company of lice, and rats which fed on unburied bodies, often carried disease.[129] Food could not usually be cooked in the front line trenches as any smoke would draw enemy fire, and hot food had to be carried up communication trenches in clumsy "hayboxes", sometimes arriving late or not at all. Disease was rife in the damp, rat infested conditions, with many troops suffering from trench foot, trench fever and trench nephritis. They suffered frost bite in the cold winter months and heat exhaustion in the summer and the men were frequently wet and extremely muddy, or dry and exceedingly dusty.[129][131]

Daily routine

Trench sentry from the Cheshire Regiment 1916, what's not so obvious are the four men sleeping in the trench

The daily routine of life in the trenches began with the morning 'stand-to. An hour before dawn everyone was roused and ordered to man their positions in order to guard against a dawn raid by the Germans.[132] With stand-to over, it was time for the men to have breakfast, wash and go to the toilet. Once this had been completed the NCO's would assign daily chores, before attending to the cleaning of rifles and equipment, filling sandbags, repairing trenches or digging latrines.[132] Once the daily chores had been completed the men who were off duty would find a place to sleep.[132] Due to the constant bombardments and the sheer effort of trying to stay alive, sleep deprivation was common. Soldiers also had to take it in turns to be on sentry duty, watching for enemy movements.[133]

Given that each side's front line was constantly under watch by snipers and lookouts during daylight, movement was therefore restricted until night fell and after the dusk stand-to.[132] Under the cover of darkness troops attended to vital maintenance and resupply, with rations and water being brought to the front line, and fresh units swapped places with troops returning to the rear for rest and recuperation.[132] Trench raiding was also carried out and construction parties formed to repair trenches and fortifications, while wiring parties were sent out to repair or renew the barbed wire in no man's land.[132] Then an hour before dawn, everyone would stand-to again.[132]

Move into the front line

There was a set procedure for a division that was moving into the front line. Once they had been informed that they were moving forward, the brigadiers and battalion commanders would be taken to the forward areas to reconnoitre the sections of the front that were to be occupied by their troops.[134] Meanwhile, the battalion transport officers would be taken to the headquarters of the division that they were relieving in order to observe the methods used for drawing rations and ammunition, and the manner in which they were supplied to the troops at the front. Detachments from the divisional artillery group would move forward and were attached to the artillery batteries of the division they were relieving.[134] Five days later, the infantry battalions that were destined for the front line sent forward their specialists from the Lewis gun teams, the grenade officer, the machine gun officer, the four company commanders, and some of the signallers to take over the trench stores and settle into the trench routine before the battalions moved in.[134] Overnight, the battalions would move into the line, and the artillery would take over the guns that were already in position, leaving theirs behind to be taken over by the batteries that had been relieved.[134]

Western front

Under the command of Field Marshal Sir John French,[25] the BEF began to deploy to France within days of the declaration of war.[135] The first encounter with the Germans came at Mons on 23 August 1914,[135] after which the Allies began the Great Retreat, during which the BEF was involved in the battle of Le Cateau.[136] The BEF had a small role in halting the German advance at the Marne,[137] before participating in the Aisne counter-offensive,[138] in September which was followed by a period known as the "Race to the Sea" during which the BEF redeployed to Flanders.[139] For the BEF, 1914 ended with "First Ypres" which marked the beginning of a long struggle for the Ypres salient.[140] British casualties in the fighting between 14 October and 30 November were 58,155 (7,960 dead, 29,562 wounded and 17,873 missing). It is often said that the pre war professional army died at the first battle of Ypres.[140] The army had arrived in France with 84,000 infantry. By the end of the battle of Ypres, the BEF had suffered 86,237 casualties, mostly to the infantry.[140]

British infantry advancing through gas during the battle of Loos, 25 September 1915.

Trench warfare prevailed in 1915 and the BEF, as the junior partner on the Western Front, fought a series of small battles, at times coordinated with the larger French offensives: the battle of Neuve Chapelle which is always associated with the shell crisis, the battle of Aubers Ridge and the battle of Festubert in May and the battle of Givenchy in June.[141][142][143] On 22 April 1915, the Germans launched the second battle of Ypres, employing poison gas for the first time on the Western Front and capturing much of the high ground that ringed the salient.[144] By September 1915 the British Army had grown in strength, with the first of Kitchener's New Army divisions entering the line, and as part of the third battle of Artois,[145] the Army launched a major attack the battle of Loos utilising its own newly developed chemical weapons for the first time.[146] The resulting failure marked the end for Field Marshal French. On 19 December 1915, General Sir Douglas Haig replaced him as Commander in Chief of the BEF.[32]

British wounded returning from fighting on Bazentin Ridge, July 1916.

For the British Army, 1916 was dominated by the battle of the Somme which started disastrously on 1 July. The first day on the Somme remains the bloodiest day in the history of the British Army when over 19,000 soldiers were killed and a nearly 40,000 were wounded, all for little or no gain.[147] The only real success was in the south where, using imaginative tactics and helped by the French, the 18th (Eastern) Division and 30th Division took all their objectives, including Montauban, and the 7th Division captured Mametz.[147] At Thiepval the 36th (Ulster) Division seized the Schwaben Redoubt but was forced to withdraw because of lack of progress elsewhere.[147] There followed nearly five months of attrition during which the Fourth Army of General Henry Rawlinson and the Fifth Army of General Hubert Gough advanced an average of 5 miles (8.0 km) at a cost of 420,000 casualties.[148]

British machine gunners fire on German aircraft near Arras

In February 1917 the German Army began to withdraw to the Hindenburg Line and it was these formidable defences that elements of the British Army assaulted in the battle of Arras in April. For this battle, the British Prime Minister, David Lloyd George, had placed Haig and the BEF under the orders of new French Commander-in-Chief, Robert Nivelle who planned a major French Army offensive in Champagne.[149] When the battle officially ended on 16 May, British troops had made significant advances, but had been unable to achieve a major breakthrough at any point.[149] Having failed to deliver a breakthrough and Haig, now embarked on his favoured plan to launch an offensive in Flanders. In a successful preliminary operation, General Herbert Plumer's Second Army seized the Messines ridge south of Ypres.[150] The battle of Passchendaele, which began on 31 July 1917, was one of the worst ordeals endured by British and Dominion forces during the war, with the battlefield reduced to a quagmire. It was not until 6 November that the Passchendaele ridge was captured, by which time the British Army had sustained 310,000 casualties.[151] For the British Army 1917, ended with the battle of Cambrai which demonstrated the potential of tanks operating en masse. Third Army commander, General Julian Byng, planned an ambitious breakthrough and achieved an unprecedented advanced of 5 miles (8.0 km) on the first day but lacked the reserves to either continue or consolidate. A German counter-offensive succeeded in recapturing most of the lost ground.[152]

The final year of the war 1918, started with disaster and ended in triumph. On 21 March 1918, German General Erich Ludendorff, launched the Spring Offensive and the main weight of the first blow, Operation Michael, fell on the British Fifth Army of General Gough which was forced into retreat, finally halting the German advance on the Marne in June 1918.[153] The next German attack came south of Ypres in the battle of the Lys river and here too the British Army fell back. Haig issued his famous Order of the Day, "With our backs to the wall and believing in the justice of our cause, each one of us must fight on to the end." In response to the crisis facing the Allies, French general Ferdinand Foch was made Supreme Commander for Allied forces on the Western Front, placing the BEF under his strategic direction.[154][155] On 8 August 1918, General Rawlinson's Fourth Army launched the battle of Amiens which marked the start of the Hundred Days Offensive, the final Allied offensive on the Western Front. Over the following weeks, all five armies of the BEF went on the offensive from the Somme to Flanders.[156] Fighting continued right up until the Armistice with Germany came into effect at 11.00 am on 11 November 1918.[157]

In the final offensive, the BEF captured 188,700 prisoners and 2,840 guns which was only 7,800 prisoners and 935 guns less than those taken by the ,French, Belgian and American armies combined.[158]

Other campaigns


British troops arrive at Tsingtao 1914

In 1914, the British Army was involved in what became know as the Siege of Tsingtao when the 2nd Battalion South Wales Borderers landed in China in support of Japanese forces in the capture of the German port of Tsingtao.[159] The British were part of a 23,0000 strong task force which included a mixed British–Indian Brigade of 1,500 troops and the British battleship, HMS Triumph. A bombardment of the port started on 31 October 1914, and by 7 November 1914, the Japanese 18th Division and 29th Infantry Brigade, and the British–Indian Brigade, had stormed and captured the garrison and its 4,000 troops.[160]

East African campaign

The year 1914 also witnessed the commencement of the East African Campaign against von Lettow-Vorbeck's elusive German and African askari forces. Most British operations in Africa, however, were carried out by African askari units such as the King's African Rifles (KAR), or South African or Indian Army units. The British force was led, in turn, by British General Horace Smith-Dorrien, South African General Jan Smuts, and British General Arthur Reginald Hoskins.[160][161] The force was comprised of units of the KAR and the 27th Bangalore Brigade from the British Indian Army, with the 2nd Battalion, Loyal Regiment (North Lancashire) under command. The German forces of von Lettow-Vorbeck's Schutztruppe remained undefeated and surrendered on 25 November 1918, 14 days after the Armistice in Europe.[160]

The casualty rate amongst British and Empire troops, excluding the Africans, was 6,000 dead and 3,000 wounded. More troops died from diseases than from enemy action, and illness accounted for 70 percent of the total casualties.[160]

Mesopotamia campaign

March 1917, British troops entering Baghdad.

The British Army force fighting in Mesopotamia was principally drawn from the British Indian Army, with only one solely British formation, the 13th (Western) Division. Its objective was to secure the Royal Navy's oil supply from Persia. On 7 November 1914, the British Indian force, led by General Sir John Nixon, invaded Mesopotamia, and on 23 November, they entered Basrah.[160] After this initial invasion, there followed a disastrous and humiliating defeat of the British by the Turks at the Siege of Kut-al-Amara, from 7 December 1915 to 29 April 1916, when the entire garrison of 13,000 British and Indian troops surrendered.[160] The British reorganised and raised the number of available troops to 250,000.[160] The British eventually regained momentum upon General Frederick Stanley Maude becoming commander, and a new British offensive began in December 1916. On 24 February 1917, Kut-al-Amara fell to the joint British and Indian force, and Baghdad was captured in March 1917.[160] A week after the capture of Baghdad, General Maude issued the Proclamation of Baghdad, which contained the famous line, "our armies do not come into your cities and lands as conquerors or enemies, but as liberators".[162] After General Maude's death from cholera on 18 November 1917, he was succeeded by Lieutenant General Sir William Marshall, who continued with the River War until October 1918, when the British captured the Mosul oil fields, a development that led to the collapse of the Turkish forces. The Armistice of Mudros with Turkey was signed on 30 October 1918. During the campaign, there were 100,000 British and Indian casualties. Of these, 53,000 died, with 13,000 of the dead succumbing to disease.[160]

Gallipoli campaign

V Beach, Helles Gallipoli.

Turkey had entered the war on the side of the Germans on 31 October 1914. One its first acts was to close the Dardanelles Straits to the Allies.[160] In April 1915, following the failure of the Royal Navy's attempt capture the Dardanelles, the British and ANZAC forces landed on the Gallipoli peninsula, under the command of General Ian Hamilton.[160] The main British attacks were the first, second and the third battle of Krithia. These were a series of attacks against the Turkish defences aimed at capturing the original objectives of 25 April 1915. They all failed to achieve their objectives.[163] In August, another landing was made at Suvla Bay. The Suvla landing was reinforced by the arrival of the 10th Division from Kitchener's New Army, the 53rd, and the 54th first-line Territorial divisions and the dismounted yeomanry of the 2nd Mounted Division.[160] The 29th Division was also moved from Helles to Suvla for one more push. The final British attempt to resuscitate the offensive came on 21 August, with attacks at Scimitar Hill and Hill 60. Control of these hills would have united the Anzac and Suvla fronts, but neither battle achieved success. When fighting at Hill 60 ceased on 29 August, the battle for the Sari Bair heights, and indeed, the battle for the peninsula, was effectively over, and by January 1916, the Allies had withdrawn.[160]

Estimates of casualties vary enormously, but of the around 480,000 Allied troops involved in the campaign, 180,000 were wounded and 44,000 died, 20,000 of the dead being British.[160]


The Easter Rising, was an rebellion staged in Ireland during Easter Week, 1916. The rising was mounted by Irish republicans with the aims of ending British rule in Ireland and establishing an Irish Republic. Organised by the Military Council of the Irish Republican Brotherhood, the rising lasted from Easter Monday 24 April to 30 April 1916.[164] Members of the Irish Volunteers, joined by the smaller Irish Citizen Army, along with 200 members of Cumann na mBan, seized key locations in Dublin and proclaimed an Irish Republic independent of Britain.[165]

Army reinforcements were moved into Dublin and by 28 April, the 1,600 rebels were facing 18 to 20,000 soldiers,[164] the rising was suppressed after seven days of fighting, and its leaders were court martialled and executed.[166] The Easter Rising casualties were 450 killed, 2,614 injured, and nine missing, almost all in Dublin. The only significant action elsewhere was at Ashbourne, 10 miles (16 km) north of Dublin. Military casualties were 116 dead, 368 wounded and 9 missing, and the Irish and Dublin police forces had 16 killed and 29 wounded and 254 non combatant civilians died.[164]

Salonika campaign

men of the 4th (Highland) Mountain Brigade with 2.75 inch Mountain Gun, Salonika

A new front was opened in Salonika at the request of the Greek government, intending to support Serbian forces and oppose Bulgaria. The first troops of the British Salonika Army arrived in Salonika in October 1916, too late to prevent the Serbian Army from retreating into Albania and Greece. French, British and Russian troops arrived in Salonika between 1916 and 1917 and became known as the Army of the East or the Army of the Orient, under the overall command of French General Maurice Sarrail.[167] With the objective of destroying the Bulgarian Army, the French and British launched a new offensives in April 1917, without any significant success. A stalemate ensued without any movement by either side and the front became known as Europe's biggest internment camp for the Allies by the Germans.[160] This situation lasted until 18 September 1918, when the British and Greek Armies, under the command of General George Milne attacked in the Lake Doiran Sector.[160] The Bulgarian Army, now in retreat signed an armistice on the 30 September 1918.[160]

Italian campaign

Italy joined the war on the Allies' side on 5 May 1915, declaring war on Austria-Hungary on 23 May 1915 and on Germany on 28 August 1916. The British Army's involvement in the Italian campaign started much later, in late 1917, when British troops were sent to help prevent a collapse on the Italian front. On 24 October 1917 in the battle of Caporetto the Second Italian Army collapsed and the Italians were forced to retreat to the Piave River, where they could be reinforced with five British Divisions and six French Divisions from the Western Front, complete with supporting arms and commanded by General Herbert Plumer. The reinforced Italians the successfully managed to halt the Austro-Hungarian advance at the battle of the Piave river. During the Allied counter attack in October 1918, the Austro-Hungarian Army collapsed after taking heavy losses at the battle of Vittorio Veneto. An armistice was signed shortly after on 3 November 1918.[160]

Fighting the Senussi Arabs

In late November 1915, in response to the growing threat from a pro-Turkish Islamic Arab sect known as the Senussi, a composite British force known as the 'Western Frontier Force' was sent into the Libyan Desert to Mersa Matruh, under the command of British Indian Army officer Major General Alexander Wallace. A series of sharp battles against the Arabs ensued at Um Rakhum, Gebel Medwa, and Halazin during December and January. The Western Desert Force, now under Major General William Peyton, re-occupied Sidi Barrani and Sallum in February and March 1916. Shipwrecked British seamen from HMT Moorina and HMS Tara, who had been held at Bir Hakeim, were rescued by a force of armoured cars led by the Duke of Westminster.[168]

Sinai and Palestine campaign

General Edmund Allenby, enters Jerusalem on foot out of respect for the Holy City, 31 December 1917

The Sinai and Palestine Campaign was fuelled by criticism of the policy of a static defence of the Suez Canal, which employed six infantry divisions and five mounted brigades.[169] After the repulse of the Turkish First Suez Offensive, nine divisions were sent to the Western Front and one to Mesopotamia.[170]

The British Army in the Sinai and Palestine subsequently included the 10th, 42nd, 52nd, 53rd, 54th, 60th, 74th and the 75th Divisions. British yeomanry formed part of the Anzac Mounted Division, Australian Mounted Division and Yeomanry Mounted Division. With the Imperial Camel Corps Brigade, these mounted troops formed the Desert Column. The whole force, known as the Egyptian Expeditionary Force (EEF), was under the command of General Sir Archibald Murray in Cairo.[171]

Murray made steady progress against the Turkish forces, which were defeated in the battle of Romani, the battle of Magdhaba and the battle of Rafa. However, he was repulsed at the first and second battle of Gaza in 1917.[172] The defeat in the Second Battle of Gaza prompted the War Office to change the command of the EEF, and on 28 June 1917, Murray was replaced by General Sir Edmund Allenby, who reinvigorated the campaign.[173]

Allenby reorganised his forces along more conventional lines. The EEF now included the Desert Mounted Corps, under Lieutenant General Sir Harry Chauvel; the XX Corps under Lieutenant General Sir Phillip Chetwode and the XXI Corps under Lieutenant General Edward Bulfin.[174] In October 1917 they defeated the Turkish forces in the third battle of Gaza and the battle of Mughar rudge, which succeeded in causing the Ottoman Seventh and Eighth Armies to withdraw towards Jerusalem and Haifa respectively. This led to the capture of Jerusalem in December 1917.[160]

In February and April 1918, Australian mounted troops took part in two raids east across the Jordan River near Es Salt, a village in Palestine 14 miles (23 km) west of Amman. Although these raids were unsuccessful, they encouraged Turkish commanders to believe that the main British effort would be launched across the Jordan, when in fact it would be launched along the coastal plain.[175] The EEF was greatly weakened at this time by the crisis in France, which led to the despatch of the 52nd and 74th Divisions to the Western Front, the breaking up of the Yeomanry Mounted Division, and the replacement of most of the British infantry in four of the remaining divisions by Indian troops.[176] However in September 1918, Allenby's forces won the decisive Megiddo Offensive, which precipitated the Armistice of Mudros with the Ottoman Empire, which was signed on the 31 October 1918.[177]

Total Allied casualties in the Sinai and Palestine campaign were 60,000 of which 20,000 were killed. Some 15,000 of the dead were British.[160]


Following the abdication of the Russian Tsar in 1917, the Caucasus Front collapsed, leaving Central Asia—and beyond it India—open to the Turkish Army. The War Office responded with a plan to send a force of hand-picked British officers and NCOs to organise any remaining Russian forces or civilians who were ready to fight the Turkish forces. This force became known as Dunsterforce after its commander, Major General Lionel Charles Dunsterville, the inspiration for the titular character of Rudyard Kipling's novel Stalky & Co. Dunsterforce arrived in Baku in August 1918. It was hoped that Dunsterforce could raise an army from the Christian Georgian, Armenian and Assyrian people who had supported the Russians and had historically feared the Turks. While Dunsterforce had some successes the task proved beyond its ability.[178]


The British Army during World War I was the largest military force that Britain had put into the field up to that point.[179] On the Western Front, the BEF ended the war as the strongest fighting force, more experienced and bigger than the American Army and with better morale then the French Army.[179]

The cost of victory was high. The official "final and corrected" casualty figures for the British Army, including the Territorial Force, were issued on 10 March 1921. The losses for the period between 4 August 1914, and 30 September 1919, included 573,507 "killed in action, died from wounds and died of other causes" and 254,176 missing (minus 154,308 released prisoners), for a net total of 673,375 dead and missing. Casualty figures also indicated that there were 1,643,469 wounded.[180]

For some, the fighting did not end in 1918. The army dispatched troops to Russia during the Allied intervention in the Russian Civil War, which was followed by the Anglo-Irish War in January 1919 and the Third Anglo-Afghan War in May 1919.[181] The third Afghan war was followed by the 1920 conflict between British forces and Somaliland dervishes. Those not involved in fighting or occupation duties were demobilised. The demobilisation of 4,000,000 men that followed the end of the war had, within a year, reduced the army to 800,000; and by November 1920, this figure had fallen to 370,000 men.[182]

The Ten Year Rule was introduced in August 1919, which stipulated that the armed forces should draft their estimates "on the assumption that the British Empire would not be engaged in any great war during the next ten years." In 1928, Winston Churchill, as Chancellor of the Exchequer, successfully urged the Cabinet to make the rule self perpetuating and hence it was in force unless specifically countermanded.[183] There were cuts in defence spending as a result of this rule, with defence spending falling from £766 million in 1919–1920, to £189 million in 1921–1922, and to £102 million in 1932.[184]

The British Army tried to learn the lessons of World War I, and adopt them into its pre war doctrine.[185] In the 1920s and much of the 1930s the General Staff tried to establish a small, mechanised, professional army, and formed the Experimental Mechanized Force, but with the lack of any identified threat, the Army's main function reverted to garrison duties around the British Empire.[186]


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