Mars, a 329-ton side-wheel river steamer, was built at Cincinnati, Ohio, in 1856. Employed by the Confederacy as a transport, she was captured at Island Number Ten on 7 April 1862. She thereafter served as a tender to the U.S. Mississippi Squadron before returning to merchant service in 1863. SS Mars struck a snag and sank at Cogswell Landing, Missouri, on 8 July 1865.