Sunken battlecruisers are large capital ships built in the first half of the 20th century that were either destroyed in battle, scuttled, or destroyed in a weapon test. They were similar in size and cost to a battleship, and typically carried the same kind of heavy guns, but battlecruisers generally carried less armor and were faster. The first battlecruisers[Note 1] were developed in the United Kingdom in the first decade of the century, as a development of the armored cruiser, at the same time the dreadnought succeeded the pre-dreadnought battleship. The original aim of the battlecruiser was to hunt down slower, older armored cruisers and destroy them with heavy gunfire. However, as more and more battlecruisers were built, their opponents became ships of their own type, not slower, weaker vessels.[3]
In World War I, the thin armor of British battlecruisers did not serve them well in combat with their better-armored German counterparts and three were lost at the Battle of Jutland in 1916. SMS Lützow, a German battlecruiser, was also sunk during the battle. Five German battlecruisers were scuttled by their crews in 1919 to prevent their seizure by the Royal Navy after the First Armistice at Compiègne in 1918.
Between the World Wars, the Washington Naval Treaty of 1922 limited the number and tonnage of capital ships that could be retained. Many battlecruisers were scrapped during this period, though HMAS Australia, the sole Australian battlecruiser, was scuttled to comply with the treaty. One provision of the treaty allowed nations to convert two battlecruisers then under construction into aircraft carriers and both the Empire of Japan and the United States took advantage of the opportunity. The British also converted all three of their "light battlecruisers" into aircraft carriers even though they were not subject to the treaty. The Japanese rebuilt their four remaining battlecruisers into fast battleships during the 1930s.
World War II took a heavy toll on the remaining battlecruisers, both converted and unconverted. In contrast to World War I, where all four ships were lost to gunfire, only two were sunk solely by guns. Two battlecruisers were sunk by a combination of gunfire and aerial attack, four were sunk solely by aircraft and two were sunk by submarines. The largest loss of life in the sinking of a battlecruiser was the 1,415 killed in the sinking of HMS Hood during her confrontation with the German battleship Bismarck in 1941. Of the three surviving World War II battlecruisers, two were scrapped after the war and one, USS Saratoga, was sunk by nuclear weapon tests in 1946.
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