Japanese battleship Ise
Despite the expensive reconstruction, the ship was considered obsolete by the eve of the Pacific War, and did not see significant action in the early years of the war. Following the loss of most of the IJN's large aircraft carriers during the Battle of Midway in mid-1942, she was rebuilt with a flight deck replacing the rear pair of gun turrets to give her the ability to operate an air group of floatplanes; lack of aircraft and qualified pilots meant that "Ise" never actually operated her aircraft in combat. She participated in the Battle of Cape Engaño in late 1944, where she decoyed the American carrier fleet supporting the invasion of Leyte away from the landing beaches. Afterwards the ship was transferred to Southeast Asia; in early 1945 "Ise" participated in Operation Kita, where she transported petrol and other strategic materials to Japan. The ship was then reduced to reserve until she was sunk during American airstrikes in July. After the war "Ise" was scrapped in 1946–1947.
Italian submarine Iride
"Iride" secretly participated in the Spanish Civil War, being a part of two incidents that strained Italo-British relations. She carried out a mission from 24 August – 5 September 1937 under command of Junio Valerio Borghese. On August 26, "Iride" arrived at her designated area between Ibiza and Cape San Antonio. During the patrol she attempted attacks 8 times, but only fired on two of those. In the evening of August 29, she sighted a cargo ship heading towards Valencia, and attacked it twice, second time from 600 meters, and both were unsuccessful. At 20:45 on August 30, 1937, while traveling on the surface, she sighted British destroyer steaming from Valencia to Gibraltar, and mistaking it for a Spanish naval ship of the , launched a 450mm torpedo from 700 meters at 20:52. managed to avoid the torpedo with a sharp turn to the starboard, and then went on to search for the submarine using her sonar. However, the sonar showed a different position than where the submarine was sighted, and proceeded to launch depth charges on the sonar location. British destroyers , and , and a cruiser joined in, and continued the attack for nine hours. "Iride" hiding at a great depth managed to survive and did not sustain any serious damage.