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II Corps (Union Army): Wikis


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There were five corps in the Union Army designated as II Corps (Second Army Corps) during the American Civil War.

Of these five, the one most widely known was in the Army of the Potomac, the subject of this article.

Corps history

Union Army 3rd Division Badge, II Corps, Army of the Potomac

The II Corps was prominent by reason of its longer and continuous service, larger organization, hardest fighting, and greatest number of casualties. Within its ranks was the regiment that sustained the largest percentage of loss in any one action; the regiment that sustained the greatest numerical loss in any one action; and the regiment that sustained the greatest numerical loss during its term of service. Of the one hundred regiments in the Union Army that lost the most men in battle, thirty-five of them belonged to the II Corps.

The corps was organized under General Orders No. 101, March 21, 1862, which assigned General Edwin V. Sumner to its command, and Generals Israel B. Richardson, John Sedgwick, and Louis Blenker to the command of its divisions. Within three weeks of its organization the corps moved with George B. McClellan's Army of the Potomac on the Peninsula Campaign, except for Blenker's division, which was withdrawn on March 31 from McClellan's command, and ordered to reinforce John C. Frémont's army in western Virginia. Blenker's division never rejoined the corps. The remaining two divisions numbered 21,500 men, of whom 18,000 were present for duty.

The first general engagement of the corps occurred at Fair Oaks, where Sumner's prompt and soldierly action brought the corps on the field in time to retrieve a serious disaster, and change a rout into a victory. The casualties of the two divisions in that battle amounted to 196 killed, 899 wounded, and 90 missing. In the Seven Days Battles it lost 201 killed, 1,195 wounded, and 1,024 missing. Upon the withdrawal of the army from before Richmond, it moved to the support of John Pope's Army of Virginia at Second Bull Run, arriving on that field in time to go into position at Chantilly, but was not engaged.

The corps then marched on the Maryland Campaign, during which William H. French's (3rd) Division was added. At Antietam the corps was prominently engaged, its casualties amounting to more than double that of any other corps on the field. Out of 15,000 effectives, it lost 883 killed, 3,859 wounded, and 396 missing; total, 5,138. Nearly one-half of these casualties occurred in Sedgwick's (2nd) Division, in its bloody and ill-planned advance on the Dunker church, an affair that was under Sumner's personal direction. The Irish Brigade, of Richardson's (1st) Division, also sustained a terrible loss in its fight at the "Bloody Lane", but, at the same time, inflicted a greater one on the enemy. This allowed Col. Francis C. Barlow to lead the 61st and 64th NY to break through the Confederate line.General Richardson was killed in this battle, and General Sedgwick received three wounds.

The next battle was at Fredericksburg. In the meantime Sumner had been promoted to the command of a Grand Division—II and IX Corps—and General Darius N. Couch, a division commander of the IV Corps, was appointed to his place. General Winfield S. Hancock succeeded to the command of Richardson's (1st) Division, and General Oliver O. Howard took Sedgwick's place, the latter being absent on account of wounds. The loss of the corps at Fredericksburg exceeded that of any other in that battle, amounting to 412 killed, 3,214 wounded, and 488 missing, one-half of which fell on Hancock's Division in the unsuccessful assault on Marye's Heights. The percentage of loss in Hancock's Division was large, Caldwell's (1st) Brigade losing 46 percent killed and wounded.

After Fredericksburg, the Grand Divisions were discontinued and, General Sumner retiring on account of age and physical disabilities, General Couch remained in command. Couch led the corps at Chancellorsville, with Hancock, John Gibbon, and French as his division commanders. Sedgwick had been promoted to the command of the VI Corps, and Howard, who had commanded Sedgwick's Division at Fredericksburg, was promoted to the command of the XI Corps. At Chancellorsville, the principal part of the II Corps' fighting fell on Hancock's Division, its skirmish line, under Colonel Nelson A. Miles, distinguishing itself by a successful resistance to a strong attack of the enemy, making one of the most interesting episodes in the history of that battle. During the fighting at Chancellorsville, Gibbon's (2nd) Division remained at Fredericksburg, where it supported Sedgwick's operations, but with slight loss.

Not long after Chancellorsville, General Couch was relieved at his own request, Hancock succeeding to the command of the corps, and Caldwell to that of Hancock's Division. At the start of the Gettysburg Campaign, General Alexander Hays' Brigade joined, and was assigned to the 3rd Division, Hays taking command of the division. At Gettysburg, the corps was hotly engaged in the battles of the second and third days, encountering there the hardest fighting in its experience, and winning there its grandest laurels; on the second day, in the fighting at the Wheatfield, and on the third, in the repulse of Pickett's Charge, which was mostly directed against Hancock's position. The fighting was deadly in the extreme, the percentage of loss in the 1st Minnesota, Gibbon's Division, being without an equal in the records of modern warfare. The loss in the corps was 796 killed, 3,186 wounded, and 368 missing; a total of 4,350 out of less than 10,500 engaged. Gibbon's Division suffered the most, the percentage of loss in William Harrow's (1st) Brigade being unusually severe. Hancock and Gibbon were seriously wounded, while of the brigade commanders, Samuel K. Zook, Edward E. Cross, George L. Willard, and Eliakim Sherrill were killed. The monthly return of the corps, June 30, 1863, shows an aggregate of 22,336 borne on the rolls, but shows only 13,056 "present for duty." From the latter deduct the usual proportion of non-combatants—the musicians, teamsters, cooks, servants, and stragglers—and it becomes doubtful if the corps had over 10,000 muskets in line at Gettysburg.

General Hancock's wounds necessitated an absence of several months. General William Hays was placed in command of the corps immediately after the battle of Gettysburg, retaining the command until August 12, when he was relieved by General Gouverneur K. Warren. Warren had distinguished himself at Gettysburg by his quick comprehension of the critical situation at Little Round Top, and by the energetic promptness with which he remedied the difficulty. He had also made a brilliant reputation in the V Corps, and as the chief topographical officer of the Army of the Potomac. He was, subsequently, in command at Bristoe Station, a II Corps affair, and one which was noticeable for the dash with which officers and men fought, together with the superior ability displayed by Warren himself. He also commanded at Mine Run and Morton's Ford, the divisions at that time being under Generals John C. Caldwell, Alexander S. Webb and Alexander Hays.

Upon the reorganization of the Army of the Potomac, March 23, 1864, the III Corps was discontinued, and two of its three divisions were ordered transferred to the II Corps. Under this arrangement the II Corps was increased to 81 regiments of infantry and 10 batteries of light artillery. The units of the old II Corps were consolidated into two divisions, under Generals Francis C. Barlow and John Gibbon; the two divisions of the III Corps were transferred intact, and were numbered as the 3rd and 4th, with Generals David B. Birney and Gershom Mott in command. By this accession, the II Corps attained in April, 1864, an aggregate strength of 46,363, with 28,854 present for duty.

General Hancock, having partially recovered from his wounds, resumed command, and led his battle-scarred divisions across the Rapidan River. In the Battle of the Wilderness, the corps lost 699 killed, 3,877 wounded, and 516 missing; total, 5,092, half of this loss falling on Birney's (3rd) Division. General Alexander Hays, commanding the 2nd Brigade of Birney's Division, was among the killed.

At Spotsylvania the II Corps again attained a glorious place in history by Hancock's brilliant and successful assault on the morning of May 12. During the fighting around Spotsylvania, Mott's (4th) Division became so depleted by casualties, and by the loss of several regiments whose term of service had expired, that it was discontinued and merged into Birney's Division, Mott retaining the command of a brigade. The casualties of the corps in the various actions around Spotsylvania, from May 8 to May 19, aggregated 894 killed, 4,947 wounded, and 801 missing; total 6,642, or over one-third of the loss in the entire Army of the Potomac, including the IX Corps. The heaviest loss occurred in Barlow's (1st) Division. Up to this time the II Corps had not lost a color nor a gun, although it had previously captured 44 stands of colors from the enemy.

After more of hard and continuous fighting at the North Anna River, and along the Totopotomoy, the corps reached the memorable field of Cold Harbor. While at Spotsylvania it had been reinforced by a brigade of heavy artillery regiments, acting as infantry, and by the brigade known as the Corcoran Legion, so that at Cold Harbor it numbered 53,831, present and absent, with 26,900 "present for duty". Its loss at Cold Harbor including eleven days in the trenches, was 494 killed, 2,442 wounded, and 574 missing; total, 3,510. Birney's Division was but slightly engaged.

In the assaults on the Petersburg entrenchments, June 16 – June 18, the Corps is again credited with the largest casualty list. In one of these attacks, the 1st Maine Heavy Artillery sustained the most remarkable loss of any regimental organization in any one action during the war. At this time the corps contained 85 regiments; its effective strength, however, was less than at a previous date. The corps recrossed the James River, and fought at Deep Bottom, July 26, and again on August 14; then, having returned to the lines around Petersburg, Barlow's and Birney's Divisions were engaged at Ream's Station, on August 25, in which it lost a large number of men captured.

At the Battle of the Boydton Plank Road, October 27, 1864, the division commanders were Generals Thomas W. Egan and Mott, the 1st Division (Nelson A. Miles's), being retained in the trenches. In November, 1864, General Hancock was assigned to other duty, and General Andrew A. Humphreys, chief of staff to the Army of the Potomac, succeeded to his position. He was in command during the final campaign, the divisions being under Generals Miles, William Hays, and Mott. The corps fought its last battle at Farmville, April 7, 1865, two days before Lee's surrender. In this final action General Thomas A. Smyth, a brigadier general in Hays' (2nd) Division, was killed. Smyth was an officer with a brilliant reputation, and at one time commanded the famous Irish Brigade.

Command history

Edwin V. Sumner March 13, 1862 – October 7, 1862
Darius N. Couch October 7, 1862 – December 26, 1862
John Sedgwick December 26, 1862 – January 26, 1863
Oliver O. Howard January 26, 1863 – February 5, 1863
Darius N. Couch February 5, 1863 – May 22, 1863
Winfield S. Hancock May 22, 1863 – July 1, 1863
John Gibbon July 1, 1863 – July 2, 1863
Winfield S. Hancock July 2, 1863 – July 3, 1863
William Hays July 3, 1863 – August 16, 1863
Gouverneur K. Warren August 16, 1863 – August 26, 1863
John C. Caldwell August 26, 1863 – September 2, 1863
Gouverneur K. Warren       September 2, 1863 – October 10, 1863
John C. Caldwell October 10, 1863 – October 12, 1863
Gouverneur K. Warren October 12, 1863 – December 16, 1863
John C. Caldwell December 16, 1863 – December 29, 1863
Gouverneur K. Warren December 29, 1863 – January 9, 1864
John C. Caldwell January 19, 1864 – January 15, 1864
Gouverneur K. Warren January 15, 1864 – March 24, 1864
Winfield S. Hancock March 24, 1864 – June 18, 1864
David B. Birney June 18, 1864 – June 27, 1864
Winfield S. Hancock June 27, 1864 – November 26, 1864
Andrew A. Humphreys November 26, 1864 – February 15, 1865
Gershom Mott February 15, 1865 – February 17, 1865
Nelson A. Miles February 17, 1865 – February 25, 1865
Andrew A. Humphreys February 25, 1865 – April 22, 1865
Francis C. Barlow April 22, 1865 – May 5, 1865
Andrew A. Humphreys May 5, 1865 – June 9, 1865
Gershom Mott June 9, 1865 – June 20, 1865
Andrew A. Humphreys June 20, 1865 – June 28, 1865


  • Eicher, John H., and Eicher, David J., Civil War High Commands, Stanford University Press, 2001, ISBN 0-8047-3641-3.
  • Fox, William F., Regimental Losses in the American Civil War, reprinted by Morningside Bookshop, Dayton, Ohio, 1993, ISBN 0-685-72194-9.


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