Along the fort's northeast and northwest walls, there are four mounts such as these, plus one more at the fort's eastern interior corner. These were for 15" guns, likely also Columbiads, since this would have been during the Civil War or slightly after. You may recall that this is the same kind of mount found on the North Bastion. Was there ever anything mounted on these mounts? If nothing is ever mounted on a mount, what would it then be accurately called? A potential mount?