tube was in the bow, two tubes on each broadside and a tube in the stern. The ship mostly used compound armor supplied by Charles Cammell of Sheffield, England. The main waterline belt had a maximum thickness of abreast the propulsion spaces, but thinned to 12 inches abreast the magazines and was only thick at its lower edge. It was long and high, most of which () was below the waterline as actually completed because she was overweight. Bulkheads nine to twelve inches thick provided transverse protection for the ship's vitals. The lower casemate armor was long and twelve inches thick. Above it were steel plates protecting the six-inch guns. The barbette armor was thick. Initially the barbette was open-topped, but a thick hemispherical hood was added later, possibly in 1893. The conning tower was protected by eight inches of steel armor. History Dvenadsat Apostolov was built by the Nikolayev Admiralty Shipyard at Nikolayev. She was laid down on 21 August 1889, launched on 13 September 1890, and sailed to Sevastopol for fitting out on 11 May 1892. Completed in December, the ship joined the fleet on 17 June 1893, but she was not fully ready for service until 1894. In 1895 Dvenadsat Apostolov was used to test a new system of laying mines by rails that had been invented by Lieutenant A. P. Ygrumov and also to evaluate the proper dimensions for anti-torpedo nets and their booms. For this last test torpedoes were fired at the ship with the anti-torpedo nets deployed. One gun, of an unknown caliber, burst in 1903, killing one man and wounding two others. Dvenadsat Apostolov participated in the failed attempt to recapture the mutinous battleship on 30 June 1905. She attempted to ram Potemkin, but sailors sympathetic to the mutiny reversed the engines and then prevented an attempt by Dvenadsat Apostolovs commander, Captain Kolands, to blow up his own ship by severing the detonating wires. The Sevastopol Port Authority proposed to reboiler her in 1904 with new Belleville boilers, but this was forestalled by a plan to reuse those of the battleship . Three years later a proposal to rearm her with four 10-inch guns in two turrets and several 6-inch guns in a new casemate was made by the Naval General Staff. This was estimated to cost 1,275,000 roubles and would only add to her displacement, but the proposal was rejected by the