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Kawachi-class battleship : ウィキペディア英語版 | Kawachi-class battleship
The was a two-ship class of dreadnought battleships built for the Imperial Japanese Navy (IJN) in the first decade of the 20th century. Both ships bombarded German fortifications at Tsingtao during the Battle of Tsingtao in 1914, but saw no other combat in World War I. sank in 1918 after an explosion in her ammunition magazine with the loss of over 600 officers and crewmen. was disarmed in 1922 and converted into a target ship two years later to meet the terms of the Washington Naval Treaty and served until she was sunk in 1945 by American carrier aircraft. The ship was refloated after the war and scrapped in 1946–47. ==Background==
The ''Kawachi'' class was ordered on 22 June 1907 under the 1907 Warship Supplement Program after the Russo-Japanese War as Japan's first dreadnoughts,〔Lengerer, p. 74〕 although their construction was delayed by a severe depression.〔 They were one of the first steps in the fulfillment of the recently adopted Eight-Eight Fleet Program that required a fleet of eight dreadnoughts and armored cruisers.〔Evans & Peattie, pp. 150–51〕 Their design was based on the with a uniform main-gun armament〔Lengerer, p. 73〕 in the hexagonal layout used by the German dreadnoughts of the and es.〔Evans & Peattie, p. 160〕 The first iteration of the design had six twin-gun turrets, with two pairs of superfiring turrets fore and aft of the superstructure and the two other turrets amidships "en echelon" to maximize end-on fire. This layout was rejected as it exceeded the informal limit. The design was then revised with the turrets in the hexagonal layout using the same 45-caliber 12-inch guns used in the preceding battleships. In early 1908, the IJN received reports that the Royal Navy's latest battleships used longer 50-caliber guns. The Chief of the Naval General Staff, Admiral Tōgō Heihachirō, pushed to use these guns; cost considerations prevented all the guns from having the same barrel length, so they were used only in the fore and aft turrets.〔Lengerer, pp. 72–73〕
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