USS Oneota was a single-turreted built for the Union Navy during the American Civil War. Completed shortly after the end of the war, Oneota was laid up until sold to her builders in 1868, and then resold to the Peruvian Navy. Renamed BAP Manco Cápac, the ship participated in the defense of Arica during the War of the Pacific. When the town was taken by Chilean troops in 1880, she was scuttled to prevent her capture. Her wreck was rediscovered in 1960 and it has been heavily looted. Description and construction The ship was long overall, had a beam of and had a maximum draft of . Oneota had a tonnage of 1,034 tons burthen and displaced . Her crew consisted of 100 officers and enlisted men. Oneota was powered by a two-cylinder horizontal vibrating-lever steam engine that drove one propeller using steam generated by two Stimers horizontal fire-tube boilers. The engine gave the ship a top speed of . She carried of coal. Oneotas main armament consisted of two smoothbore, muzzle-loading, Dahlgren guns mounted in a single gun turret. Each gun weighed approximately . They could fire a shell up to a range of at an elevation of +7°. The exposed sides of the hull were protected by five layers of wrought iron plates, backed by wood. The armor of the gun turret and the pilot house consisted of ten layers of one-inch plates. The ship's deck was protected by armor thick. A soft iron band was fitted around the base of the turret to prevent shells and fragments from jamming the turret as had happened to earlier monitors during the First Battle of Charleston Harbor in April 1863. The base of the funnel was protected to a height of by of armor. A "rifle screen" of armor high was installed on the top of the turret to protect the crew against Confederate snipers based on a suggestion by Commander Tunis A. M. Craven, captain of her sister ship . The contract for Oneota, the only Navy ship to be named after the Oneota Tribe of the Sioux Indians, was awarded to Alexander Swift & Company; the ship was laid down in 1862 at their Cincinnati, Ohio shipyard. She was launched on 21 May 1864 and completed on 10 June 1865. The ship's construction was delayed by multiple changes ordered while she was being built—reflecting battle experience with earlier