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Tennessee-class cruiser
The ''Tennessee''-class armored cruisers were four ships built for the United States Navy between 1903 and 1906. Their main armament of four guns in twin turrets was the heaviest carried by any American armored cruiser. (The , which had been designated an armored cruiser when laid down, had also carried four ten-inch guns, but was rerated a "second-class battleship" before her commission.) Their armor was thinner than that of the six s which immediately preceded them, a controversial but inevitable decision due to newly imposed congressional restraints on tonnage for armored cruisers and the need for them to be able to steam at 22 knots. However, the fact their armor covered a wider area of the ship than in the ''Pennsylvanias'' and their increased firepower caused them to be seen by the Navy as an improvement.
The ''Tennessees'' were the largest and last American armored cruisers built, a response to foreign developments and the changing notion of the armored cruiser from fast scout, convoy escort and commerce raider to auxiliary capital ship in a battle line, despite its thin armor protection compared to that of battleships. The Battle of Tsushima in 1905 was seen to validate this concept. While they were being built, questions remained in U.S. naval circles over whether they possessed enough speed, armament or armor to perform their intended duties adequately. They were generally considered armed and protected strongly enough to combat an enemy armored cruiser successfully. Even so, it was generally conceded that with this class a limit had been reached and that the modern armored cruiser no longer exemplified the logical principles of attack and defense in warship design, which meant using the most efficient weapon to its desired end. The appearance of the British s, with their greater speed and firepower, ensured their obsolescence as fighting units.
Classified initially as armored cruisers (hull symbol: ACR), all four ships in this class were reclassified as cruisers (CA) and renamed by 1920 so their original names could be used for new battleships. , renamed ''Memphis'', was wrecked while at anchor in Santa Domingo harbor in 1916. The other three ships served in World War I. The Navy considered modernization in 1922 and 1928 to upgrade their speed and fighting capability but this did not materialize. , renamed ''Charlotte'', and , renamed ''Missoula'', were scrapped under the terms of the London Naval Treaty, which set an aggregate tonnage limit for the Navy's cruisers, and the new heavy cruisers of the and subsequent classes were entering service. , renamed ''Seattle'', was declassified in 1931 and served as a receiving ship and floating barracks until scrapped in 1946.
==Background==
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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