A 3-Barrel Pole Cannon Fired after 500 Years

The folks at Springfield Arsenal in Lorton, Virginia acquired a 16th Century cannon that would be fitted onto the end of a pole. It has three barrels. Presumably the musket nipple on the side of each barrel would be slapped against a hard surface, causing the gun to fire. At 2:55, they fire it with 75 grains of black power and a .69-caliber musket ball in each barrel.