PIECES, in the military art, include all sorts of great guns and mortars. Battering pieces are the larger sort of guns used at sieges for making the breaches; such are the 24-pounder and culverine, the one carrying a 24 and the other an 18 pound ball. Field-pieces are 12-pounders, demiculverines, 6-pounders, fackers, minions, and 3-pounders, which march with the army, and encamp always behind the second line, but in day of battle are in the front. —A soldier's firelock is likewise called his piece.