Mogami was a Japanese heavy cruiser whose keel was laid in 1931, launched in March 1934 and commissioned into the Imperial Japanese Navy in July 1935. The length of the ship was 201 m, the width 18 m and the effective displacement, after modifications, it was 13,400 tons. The maximum speed of the Mogami cruiser was about 34-35 knots. At the outbreak of World War II, the main armament was 10 203 mm guns in five twin turrets and additional armament included: 8 127 mm guns and 12 610 mm torpedo tubes. The Mogami was the first cruiser of the type to bear the same name, namely the Mogami. Cruisers of this type were originally built lightweight to meet the requirements of the Washington Disarmament Treaty of 1922. Furthermore, at the time of launch, they displaced only 9,500 tons, rather than the 10,000 tons required by this treaty for cruisers. At the same time, they had powerful artillery in the form of as many as 15 155 mm guns in five three-gun turrets! The Japanese designers, however, assumed a subsequent adaptation of this type of unit with 203 mm guns already at the design stage, which actually happened later. Being one of the first Japanese ships, welding techniques were used in their construction, but due to the lack of experience of shipyards in this field, it led to operational problems, as well as the wrong center of gravity. In the course of modernization, these defects were removed on all units of this type. The battle route of the cruiser Mogami in World War II began in December 1941 with the support of Japanese actions in the French Indochina area. At the turn of 1941/1942, Mogami continued to support and cover the Japanese landings, but already in present-day Indonesia. In February 1942, the cruiser fought in the Sunda Strait. She also took part in the Battle of Midway (June 1942), where she hit the side of the cruiser "Mikuma" while making a turn. Due to severe damage, it was headed to Japan, where the aft artillery towers were removed and the number of seaplanes carried was increased. The cruiser Mogami sank on October 25, 1944 during the Battle of Leyte Bay.