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In military fortification, a boyau is a gut, or branch of the trenches, or a ditch covered with a parapet, serving for a communication between two trenches.
Boyaus were typically constructed in a zigzag pattern to prevent exposure to direct enemy fire from the front.<ref>" Military Earthworks Terms".
Historic Landscape Initiative, National Park Service.
URL accessed 2007-01-29.</ref>
A boyau is also a line, drawn winding about, in order to enclose several tracts of land, or to attack some works.<ref> </ref>
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