Intrenchment

Is generally a ditch or trench with a parapet. The earth removed to form the ditch is used to construct the parapet. Fascines, with earth thrown over them, gabions, hogsheads, or bags filled with earth, are often employed to revet or strengthen the work when the earth is loose or sandy. Intrenchments of armies are the whole works or obstacles by which an army or large body of troops cover themselves for their defense.