Rampart gun

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(Fort.) a cannon or large gun for use on a rampart and not as a fieldpiece.

See also: Rampart

References in periodicals archive ?
I was just reading the article on the French rampart gun in Garry James' April feature "Man the Ramparts
Some of the smallest artefacts are 18th century patch boxes that are kept locked away in a display cabinet, while more unusual items are the execution axes and a rampart gun, dating back to 1790, held in the castle's armoury.
13 pounds, the Model 1838, unlike earlier rampart guns, was of short rifle length and configuration, and was nicknamed gross carabine (big carbine).
Why, you may ask, when traditional rampart guns were long and heavy, was the '38 made to short-rifle dimensions?