Today is of artillery pieces in question! Especially those used during the American Civil War!
Napoleon barrel, Parrott cannon and Gatling gun.
The twelve-pounder "Napoleon" was the most popular smoothbore cannon used during the war. It was named after Napoleon III of France and was widely admired due to its reliability and power at close range. The Gatling is a weapon with several rotating barrels. It initially used paper cartridges which limited its reliability. The tests nevertheless impressed the US Army which purchased several models in 1865. In 1866, it was modified to fire brass case ammunition. During the Civil War, the Gatling was not yet in official use in the Union army, but a few copies, purchased privately, were nevertheless used. Two of these weapons were used at the siege of Petersburg.
Source :
Joshua