gun wall

The wall gun or wall piece was a type of smoothbore firearm used in the 16th through 18th centuries by defending forces to break the advance of enemy troops. Essentially, it was a scaled-up version of the army's standard infantry musket, operating under the same principles, but with a bore of up to one-inch (25.4 mm) calibre. These weapons filled a gap in firepower between the musket and the lightest artillery pieces, such as the swivel gun. This sort of weapon may also be found described as a rampart gun, hackbut or amusette, a name originally given to early medieval hand cannon.

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