Definition of "wall-piece" [wall-piece]

• A piece of artillery prepared for mounting on the wall of a fortress, as distinguished from one intended for transportation from place to place; especially, of ancient firearms, a light gun, a long musket, or the like, mounted on a swivel. (noun)

The Century Dictionary (Public Domain)

• "Douglas, however, seized a wall-piece that was mounted in the hall, and was about to discharge it on the crowd that was pouring in upon him, when the chief seized him by the arms, and held him fast."
• "Fig. 59, or a little longer both ways, to allow for working down to the same area as the wall-piece."
• "This rancho is situated on the margin of a lake of brackish water, and we found the people actual prisoners within its walls, the gates being closed, and a man stationed on the azotea with a large wall-piece, looking out for Indians."