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Iron Duke-class battleship
The ''Iron Duke'' class was a group of four dreadnought battleships built for the British Royal Navy before the First World War. The class comprised four ships: , , , and . Launched from October 1912 to November 1913, this was the third class of Royal Navy super-dreadnoughts.
The ships were essentially repeats of the battleships; they retained the same ten 13.5 inch (34.3 cm) guns in five twin gun turrets on the centreline. However, the ''Iron Duke''s had improved armour and a more powerful secondary armament of 6-inch weapons instead of the 4-inch mounted on the earlier ships.
The four ships were the most advanced battleships in the Royal Navy at the outbreak of the First World War, though they were soon surpassed by the five ships of the . They all saw extensive service during the war with the Grand Fleet, where ''Iron Duke'' acted as the flagship for the fleet commander, Admiral John Jellicoe. Three of the ships, ''Iron Duke'', ''Benbow'', and ''Marlborough'', were present at the Battle of Jutland; the ''Emperor of India'' missed the battle by being in dock for periodic refit. The four ''Iron Duke''-class battleships saw limited active duty following the end of the war; they were all demilitarised under the terms of the London Naval Treaty signed in 1930. ''Iron Duke'' was reduced to a training and depot ship and lasted in that role until 1946 when she was scrapped. ''Benbow'' was scrapped in 1931 and ''Marlborough'' followed in 1932. ''Emperor of India'' was sunk as a gunnery target in 1931.
==Design==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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