Switzerland, a 413-ton side-wheel towboat built at Cincinnati, Ohio, in 1854, was converted to a ram in March-May 1862 for Colonel Charles Ellet's U.S. Ram Fleet. She played a distant role in the 6 June 1862 naval action off Memphis, Tennessee, and subsequently took part in operations in the Yazoo River and against Vicksburg, Mississippi.

On 25 March 1863, while commanded by Colonel Charles Rivers Ellet, Switzerland joined the ram Lancaster in an attempt to pass the Vicksburg fortress. Both ships were heavily hit by Confederate gunfire, with Lancaster being sunk. Despite her damage, Switzerland survived the trip and made a subsequent successful passage of the fortifications at Grand Gulf, Mississippi, on 31 March. She took part in operations on the Red and Atchafalaya rivers in May and June 1863. Later in the War, Switzerland was part of the Mississippi Marine Brigade. She was sold in October 1865 and was employed as the merchant steamer Switzerland until about 1870.