Image ID: ASXM

Miller, Photographic History of the Civil War, Vol. 5, p181: The gun overlooking the parapet of Castle Pinckney is a 15-inch Columbiad which used a powder charge of 40 pounds. The projectile weighed 428 pounds. A large number of these projectiles are stacked in the foreground. With an elevation of twenty degrees, the maximum range of this gun was 3,787 yards, or a little over two miles. This fort was used as a prison for Union captives in 1861.