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a narrow ditch with an embankment on each side, providing concealed passage between trenches as well as communication with the rear. Laid out in an irregular or winding path to protect personnel from enfilade fire, the trench may be up to 2 m deep and have a width of 70 cm or more at the bottom. Depending on the depth of the trench, troops may move through it either standing upright or crouching. Rifle pits, machine-gun emplacements, recesses, and other structures are built into the trench walls, with cul-de-sacs and wide areas dug out every 20–30 m to allow two-way traffic. Communication trenches on the forward slope of a hill have traverses.