During gunnery training on 5 May , there was a premature detonation in the left gun of Hyūga 's Turret No. 5 that disabled both guns and killed 51 crewmen . Both aft magazines were flooded to douse the resulting fire and save the ship . She received temporary repairs during which the turret was removed and replaced by a circular armour plate on which three triple 25 mm gun mounts were positioned . On 11 May a valve in Ise 's No. 2 engine room stuck in the open position and flooded the engine room . While under repair at Kure , both ships received prototype Type 21 radars . Commanded by Vice @-@ Admiral Shirō Takasu , the 2nd Battleship Division set sail with the Aleutian Support Group on 28 May , at the same time that most of the Imperial Fleet began an attack on Midway Island ( Operation MI ) .