High Quality Content by WIKIPEDIA articles! USS Antietam (1864) was constructed during the final years of the American Civil War but was not launched because the war was winding down in the Union's favor. She was eventually placed into service and used as a storeship and as a barracks ship until she was disposed of in 1888. The first U.S. Navy ship to be so named, Antietam was a screw sloop of war laid down in 1864 at the Philadelphia Navy Yard but was not finished by the end of the American Civil War. Instead, she remained on the stocks, about two-thirds completed until 1869.