Launched on 31 May 1930, Mutsu was the second of the two ship Nagato-class battleships built for the Imperial Japanese Navy. Commissioned on 24 October 1921, and was assigned to the 1st Battleship Division in December of that year.
During World War Two, Mutsu saw little action being in the main body of the fleet at Midway. During the Battle of the Eastern Solomons on 27 August, Mutsu, assigned to the support force,[39] fired four shells at enemy reconnaissance aircraft, the first and only time her guns were fired in anger during the war.
On 8 June 1943, Mutsu experienced a magazine explosion which cut the ship in two. of the 1,474 crew members and visitors aboard Mutsu; 1,121 men were killed in the explosion.