Was this “wall gun” used by Dick Pointer during the attack of Donnally’s Fort?

This old “wall gun” has been owned by the Greenbrier County Historical Society’s North House Museum since 1989. It was originally sold to them by Edwin A. Pattison, as having been used by Dick Pointer during the attack on Donnally’s Fort – the second largest Indian/Settler battle which ever occurred within West Virginia’s present-day boundaries. Of course it was Virginia at the time.