E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
are guns used to fire buildings, to reach troops behind hills or parapets, to bound their shells along lines and against cavalry, to breach mud walls by exploding their shells in them, etc. They project common shells, common and spherical case-shot, carcasses, and, if necessary, round shot. In a mortar the trunnions are at the end; in howitzers they are in the middle.
The howitzer was taken to pieces, and carried by the men to its destination.Grant: Personal Memoirs, chap. xi. p. 158.