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When Japan joined the World War Two in December of 1941, the IJN - Imperial HJapanese Navy - was made up of old 5500-ton light cruisers. The newest of them were three ships of Sendai class commissioned in 1925. The 10000-ton Tone and Mogami classes of cruisers had been designed secretly with 6-inch main armament in triple or 8-inch main guns in double turrets (they could be changed over), and this allowed them to be converted into heavy cruisers. The two Tone-class and four Mogami-class ships were modified and entered the War as part of the Imperial Japanese Navy heavy cruiser force...