BATTERY, sunk or buried, is when its platform is sunk or let down into the ground, so that there must be trenches cut in the earth, against the muzzles of the guns, for them to fire out at, and to serve for embrasures.
BATTERY d'Enfilade, is one that scours or sweeps the whole length of a straight line.
BATTERY en Echarpe is that which plays obliquely.
BATTERY de Reverse, that which plays upon the enemy's back.
Cameral Battery, is when several guns play at the same time upon one place.