Japanese battleship Mikasa Less than a week after the end of the war , " Mikasa " s magazine exploded and sank the ship . She was salvaged and her repairs took over two years to complete . The ship supported Japanese forces during the Siberian Intervention in the Russian Civil War . After 1922 , " Mikasa " was decommissioned in accordance with the Washington Naval Treaty and preserved as a museum ship at Yokosuka . She was badly neglected during the post - World War II Occupation of Japan and required extensive refurbishing in the later 1950s . " Mikasa " is the last remaining example of a pre - dreadnought battleship anywhere in the world . She was named after Mount Mikasa in Nara , Japan . Background . Combat experience in the First Sino - Japanese War of 1894 – 1895 convinced the Imperial Japanese Navy of weaknesses in the Jeune Ecole naval philosophy , which emphasized torpedo boat s and commerce raiding to offset expensive heavily armoured ships , and Japan embarked on a program to modernize and expand its fleet in preparation for further confrontations . In particular , Japan promulgated a ten - year naval build - up programme , with the construction of six battleships and six armoured cruiser s at its core . These ships were paid for from the £30 , 000 , 000 indemnity paid by China after losing the First Sino - Japanese War . As with the earlier " Fuji " and s , Japan lacked the technology and capability to construct its own battleships , and turned again to the United Kingdom for the four remaining battleships of the programme . " Mikasa " , the last of these ships , was ordered from the Vickers shipyard in Barrow - in - Furness in 1898 at the cost of £880 , 000 ( 8 . 8 million yen at that time ) . Although she closely resembled several of the other ships ordered in this program , she was the only ship in her class . Design and description . The design of " Mikasa " was a modified version of the s of the Royal Navy with two additional guns . " Mikasa " had an overall length of , a beam of , and a normal draught of . She displaced at normal load . The crew numbered about 830 officers and enlisted men . The ship was powered by two vertical triple - expansion steam engines , each driving one propeller , using steam generated by 25 Belleville boiler s . The engines were rated at , using forced draught , and designed to reach a top speed of although " Mikasa " proved to be faster during her sea trials in December 1901 . The ship reached a top speed of using . She carried a maximum of of coal which allowed her to steam for at a speed of . " Mikasa " s main battery consisted of the same four Elswick Ordnance Company 40 - calibre twelve - inch guns used in all of the preceding Japanese battleships . They were mounted in twin - gun barbette s fore and aft of the superstructure that had armoured hoods to protect the guns and were usually called gun turrets . The hydraulically powered mountings could be loaded at all angles of traverse while the guns were loaded at a fixed angle of + 13 . 5° . They fired projectiles at a muzzle velocity of . The ship ' s secondary armament consisted of fourteen 45 - calibre quick - firing gun s mounted in casemate s . Ten of these guns were positioned on the main deck and the other four guns were placed above them at the corners of the superstructure . They fired shells at a muzzle velocity of . Protection against torpedo boat attacks was provided by twenty QF 12 - pounder 12 cwt guns . The 12 - pounders fired , projectiles at a muzzle velocity of . Lighter guns consisted of eight three - pounder Hotchkiss guns and eight 47 - millimetre 2 . 5 - pounder Hotchkiss gun s . The three - pounder gun fired projectiles at a muzzle velocity of while the 2 . 5 - pounder fired shells at a muzzle velocity of . The ship was also equipped with four submerged 18 - inch torpedo tube s , two on each broadside . The waterline armour belt of " Mikasa " consisted of Krupp cemented armour that had a maximum thickness of over the middle of the ship . It was only inches thick at the ends of the ship and was surmounted by a six - inch strake of armour that ran between the barbettes . The barbette s were thick , but reduced to six inches at the level of the lower deck . The armour of the barbette hoods had a thickness of . The casemates protecting the secondary armament were thick and the deck armour was in thickness . The forward conning tower was protected by 14 inches of armour , but the aft conning tower only had four inches of armour . " Mikasa " , like all the other Japanese battleships of the time , was fitted with four Barr & Stroud FA3 coincidence rangefinder s that had an effective range of . In addition the ships were also fitted with 24 - power magnification telescopic gunsight s . Career . " Mikasa " , named after Mount Mikasa , was laid down by Vickers at their Barrow - in - Furness shipyard on 24 January 1899 . She was launched on 8 November 1900 and completed on 1 March 1902 . At the start of the Russo - Japanese War , " Mikasa " , commanded by Captain Hikojirō Ijichi , was assigned to the 1st Division of the 1st Fleet . She participated in the Battle of Port Arthur on 9 February 1904 when Admiral Tōgō Heihachirō led the 1st Fleet in an attack on the Russian ships of the Pacific Squadron anchored just outside of Port Arthur . Tōgō had expected his surprise night attack on the Russians by his destroyers to be much more successful than it actually was and expected to find them badly disorganized and weakened , but the Russians had recovered from their surprise and were ready for his attack . The Japanese ships were spotted by the which was patrolling offshore and alerted the Russian defences . Tōgō chose to attack the Russian coastal defences with his main armament and engage the Russian ships with his secondary guns . Splitting his fire proved to be a bad idea as the Japanese and six - inch guns inflicted very little significant damage on the Russian ships who concentrated all their fire on the Japanese ships with some effect . Although a large number of ships on both sides were hit , Russian casualties numbered only 17 while the Japanese suffered 60 killed and wounded before Tōgō disengaged . " Mikasa " was hit by two ten - inch shells during the engagement that wounded seven crewmen . The ship participated in the action of 13 April when Tōgō successfully lured out a portion of the Pacific Squadron , including Vice Admiral Stepan Makarov ' s flagship , the battleship . When Makarov spotted the five battleships of the 1st Division , he turned back for Port Arthur and " Petropavlovsk " struck a minefield laid by the Japanese the previous night . The Russian battleship sank in less than two minutes after one of her magazine s exploded , Makarov one of the 677 killed . Emboldened by his success , Tōgō resumed long - range bombardment missions , which prompted the Russians to lay more minefields which sank two Japanese battleships the following month . During the Battle of the Yellow Sea on 10 August , " Mikasa " was at the head of the column of Japanese battleships and was one of the primary targets of the Russian ships . She was hit twenty times , two of the hits knocked out her aft 12 - inch gun turret , and suffered 125 casualties among her crew . In turn she concentrated most of her fire upon the battleships and although both ships were only lightly damaged by the Japanese shells which generally failed to penetrate any armour and detonated on impact . Battle of Tsushima . At the Battle of Tsushima on 27 May 1905 , " Mikasa " again led the 1st Fleet into combat , this time against the Second and Third Pacific Squadrons detached from the Baltic Fleet . The ship opened fire at the battleship , the Russian flagship , at 1410 , and was joined by the battleship and the armoured cruiser shortly afterwards . Within an hour the Japanese ships had started a serious fire aboard the Russian ship , badly wounded the fleet commander , Vice Admiral Zinovy Rozhestvensky , knocked out her rear 12 - inch gun turret , and jammed " Knyaz Suvorov " s steering so that she fell out of formation . During this time , " Mikasa " was the focus of the Russian fire as the leading ship in the Japanese column and was hit by six 12 - inch and 19 six - inch shells . They did very little damage and Tōgō was able to cross the T of the Russian squadrons . " Knyaz Suvorov " s steering was later repaired , but she blundered between the Japanese and Russian fleets several times later in the battle and " Mikasa " fired three torpedoes at her to no avail . Later in the battle , the ship appears to have fired mostly on the battleship although fired the shots that caused the Russian ship ' s magazines to explode and sink her . At 1804 a 12 - inch shell detonated prematurely in the barrel of the right gun of the forward turret , disabling the gun and knocking out the left gun until 1840 . Another 12 - inch shell had exploded in that same barrel almost two hours earlier , but had not damaged the gun . One six - inch gun jammed after firing 19 rounds , but the only other damage to any of the ship ' s guns was one six - inch gun that was disabled by a Russian six - inch shell that entered through the gunport . She fired 124 twelve - inch shells during the battle , more than any other ship except " Asahi " s 142 . In total , " Mikasa " was hit more than 40 times during the battle , including 10 twelve - inch and 22 six - inch shells , but none of them seriously damaged her . While " Mikasa " s casualties are not precisely known , the Japanese only lost 110 men killed and 590 wounded to all causes during the battle . Six days after the Treaty of Portsmouth that ended the war was signed , " Mikasa " sank at her moorings after a fire and magazine explosion at Sasebo on the night of 11 / 12 September 1905 that killed 251 crewmen . She was refloated on 7 August 1906 , reconstructed and repaired at Sasebo Naval Arsenal . The navy took the opportunity to upgrade her existing armament with more powerful 45 - calibre 12 - inch and six - inch guns during the two years it took to repair the ship . " Mikasa " was restored to active service on 24 August 1908 . During World War I , she served on coastal - defence duties , based at Maizuru , during 1914 – 15 and was then assigned to the Second and Fifth Squadrons , in that order , for the rest of the war . The ship supported the Japanese intervention in Siberia during the Russian Civil War during 1921 and was reclassified on 1 September 1921 as a first class coastal defence ship . On 17 September , " Mikasa " ran aground near Askold Island off Vladivostok , but was not seriously damaged . Preservation . The ship was decommissioned on 23 September 1923 following the Washington Naval Treaty of 1922 and scheduled for destruction . However , at the request of the Japanese government , each of the signatory countries to the treaty agreed that " Mikasa " could be preserved as a memorial ship . On 12 November 1926 , " Mikasa " was opened for display in Yokosuka in the presence of the Crown Prince , Prince Hirohito and Tōgō . Following the surrender of Japan in 1945 , the ship deteriorated , but was restored after another campaign led by the " Japan Times " and Fleet Admiral Chester W . Nimitz that allowed the ship to reopen in 1961 .