Boyaux were trenches of communication that provided covered
passage between parallels and from parallels to batteries in an attack by
regular approaches. Boyaux for infantry were usually just wide enough for
the passage of two men (4 to 5 feet); dimensions could be increased when
it was necessary to pass artillery through the trenches rather than move
guns and howitzers into position over open ground under cover of darkness.
Boyaux were usually advanced from covered positions in rear of the
trenches of an attack and from parallel to parallel in zig-zag patterns that
defiladed the trenches from defensive artillery and small arms fire. |