William Duane, A military dictionary
“ The number of batteries to be opened before the place must determine the number of pieces of ordnance; and on the quantity or ordnance must depend the proportion of every species of stores for the service of the artillery.There must be a battery to enfilade every face of the work to be besieged, that can in any way annoy the besiegers in their approaches. These batteries, at least that part of them to be allotted for guns, need not be much longer than the breadth of the rampart to be enfiladed, and will not therefore hold more than 5 or 6 heavy guns ”
