USS Choctaw (1856)
 USS Choctaw (1856) was a large (1004-ton) steamer built for the merchant service but acquired by the Union Navy during the second year of the American Civil War.Choctaw with her crew of 106 was outfitted by the Navy as a ram with heavy rifled guns and was used both as a gunboat and as a ram on the rivers of the Confederate States of America.