The Shōkaku class consisted of two aircraft carriers built for the Imperial Japanese Navy (IJN) in the late 1930s. Completed shortly before the start of the Pacific War in 1941, the Shōkaku and Zuikaku were called "arguably the best aircraft carriers in the world" when built. With the exception of the Battle of Midway, they participated in every major naval action of the Pacific War, including the attack on Pearl Harbor, the Indian Ocean Raid, the Battle of the Coral Sea, the Guadalcanal Campaign, the Battle of the Philippine Sea and the Battle of Leyte Gulf.