Glossary of Defined Terms

Boyau

Adapted From Jebb, Siege Duties, Plate VIBoyaux 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.

Jebb, Major-General Sir J. A Practical Treatise On The Duties Required To Be Performed By Officers And Soldiers Of The Army At A Siege.
Mahan, D. H. A Treatise On Field Fortification. Pp. 144-145.
Mercur, James. Attack Of Fortified Places.

January, 2003

August, 2005