DEPTH, a technical word peculiarly applicable to bodies of men drawn up in line or column.
Depth of formation. The fundamental order of the infantry in which they should always form and act, and for which all their various operations and movements are calculated, is three ranks. The formation in two ranks is regarded as an occasional exception that may be made from it, where an extended and covered front is to be occupied, or where an irregular enemy, who deals only in fire, is to be opposed. The formation in two ranks, and at open files, is calculated only for light troops in the attack and pursuit of a timid enemy, but not for making an impression on an opposite regular line, which vigorously assails, or resists.
Depth is not only applicable to men drawn up in line, and standing at close, or open files two or three deep, but it may likewise signify the relative depth of an army marching towards any given object, in desultory columns.
DEPUTY, a term given to persons employed in the civil departments of the army, and subject to superior trusts.
Deputy pay-masters.
Deputy muster-masters.
Deputy commissaries.
Deputy judge-advocate.
DEROUTE, Fr. The total overthrow of an army, battalion, or of any armed party. See [Defeat].
To DESCEND, signifies to leave any position on an eminence for immediate action.