_To_ COVER _ground_, is to occupy a certain proportion of ground individually, or collectively. A foot soldier upon an average covers 22 inches of ground when he stands in the ranks. The dimensions are taken from his shoulder points. A file on horseback covers or occupies in the ranks about 2 feet 8 inches. Thus three file, 8 feet; twelve file will occupy about 32 feet or 10 yards and 2 feet; thirteen file, 34 feet 8 inches, or 11 yards, 1 foot 8 inches; fourteen file, 37 feet 4 inches, or 12 yards 1 foot 4 inches, and so on. One horse’s length from nose to croup, on an average, 8 feet and about 2 inches, or 2 yards 2 feet 2 inches. This consequently will be the space which about three files occupy in front. Cavalry and infantry officers cannot pay too much attention to the calculation of distances by an accurate knowlege of which, ground will be properly covered, and any proportion of men, on horseback or on foot, be drawn up so as to answer the intentions of an able general. The best way that an officer can form his eye, is to exercise it to the measurement of ground by the regular pace of two feet, used in the military drawing; by this he can calculate his interval exactly, when he once knows how many feet his division occupies; for it is only halving the number of feet, and the number, so produced, is his distance in paces of two feet each. This instruction has been given to cavalry officers, by a very able Tactician. COVER, a term in war to express security or protection: thus, to land under cover of the guns, is to advance offensively against an enemy who dares not approach on account of the fire from ships, boats or batteries. It likewise signifies whatever renders any movement imperceptible: as, under cover of the night, under cover of a wood, &c. The gallery or corridor in fortification is however, particularly distinguished by the term _Chemin Couvert_, covert way, because the glacis of the parade is its parapet. COVERT-WAY, in fortification, is a space of 5 or 6 fathoms on the border of the ditch towards the country, covered by a rising ground, which has a gentle slope towards the field. This slope is called the glacis of the covert-way. See FORTIFICATION. _Second_ COVERT-WAY, or as the French call it _avant chemin couvert_, is the covert-way at the foot of the glacis. See FORTIFICATION. CRAB. See GIN. CRANE, an instrument made with ropes, pullies, and hooks, by which great weights are raised. CREDITS. See DEBTS _and Credits_. CREMAILLE, in field fortification, is when the inside line of the parapet is broken in such a manner as to resemble the teeth of a saw; whereby this advantage is gained, that a greater fire can be brought to bear upon the defile, than if only a simple face were opposed to it; and consequently the passage is rendered more difficult. _Redouts en_ CREMAILLERE, or _Cremaille_, are such as are constructed as above mentioned. CRESSET, any great light upon a beacon, light-house, or watch-tower.