The ''Mogami''-class heavy cruisers were preceded by the ''Takao''-class heavy cruisers and were designed within the restrictions of the Washington Naval Treaty. After Japan refused to recognize the treaty, however, they were modernized with heavier armor and greater armaments, which included swapping her original triple 155 mm gun turrets with twin 203 mm gun turrets; these swaps were possible because the Japanese Navy designed the Mogami-class ships specifically with this potential in mind. | The ''Mogami''-class heavy cruisers were preceded by the ''Takao''-class heavy cruisers and were designed within the restrictions of the Washington Naval Treaty. After Japan refused to recognize the treaty, however, they were modernized with heavier armor and greater armaments, which included swapping her original triple 155 mm gun turrets with twin 203 mm gun turrets; these swaps were possible because the Japanese Navy designed the Mogami-class ships specifically with this potential in mind. |