The rifled parrott gun in this mock Northwest Bastion of a pretend Fort Sanders (miles away from where the original sat) is just one of the anachronisms the reenactor community puts up with. The only big guns in the bastion in 1863 were a brass 12-pounder Napoleon of the First Rhode Island Light Artillery and a 3-inch rifle of the Thirty-Fourth New York Battery.
But, then, the walls were red clay, not wood, there were no cotton bales on the bastion’s parapet, and there was a wedge-shaped clay ramp at the bastion’s apex (between the two Parrotts in the photo) where the fort’s commander, Lt. Samuel Nicoll Benjamin, had rigged the Rhode Island 12-pounder to be run up to fire over the parapet. En barbette, as it was called.
It did so, firing two quick rounds of canister at the attackers, and then was moved to the right wall embrasure to make room for the infantry defenders. When the 3-inch gun’s horses spooked and ran away with the gun’s ammunition limber, the First Rhode Island’s Captain William W. Buckley had his gun crew remove the 3-inch and replace it with the 12-pounder for the duration of the fight.