The Mogami-class Heavy Cruiser were preceded by the Takao-class Heavy Cruiser 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 turrets with twin 203-mm turrets; these swaps were possible because the Japanese Navy designed the Mogami-class ships specifically with this potential in mind. | The Mogami-class Heavy Cruiser were preceded by the Takao-class Heavy Cruiser 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 turrets with twin 203-mm turrets; these swaps were possible because the Japanese Navy designed the Mogami-class ships specifically with this potential in mind. |