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Operation Ten-Go (天号作戦, Ten-gō Sakusen), also known as Operation Heaven One (or Ten-ichi-gō 天一号), was the last major Japanese naval operation in the Pacific Theater of World War II. The resulting engagement is also known as the Battle of the East China Sea. In April 1945, the Japanese battleship Yamato, the largest battleship in the world, and nine other Japanese warships, embarked from Japan for a suicide attack on Allied forces engaged in the Battle of Okinawa. The Japanese force was attacked by U.S. carrier-borne aircraft before it could reach Okinawa; Yamato and five other Japanese warships were sunk. The battle demonstrated U.S. air supremacy in the Asiatic-Pacific Theater and the vulnerability of surface ships without air cover from aerial attack. The battle also exhibited Japan's willingness to make extreme sacrifices in kamikaze attacks aimed at slowing the Allied advance on the Japanese home islands. Background By early 1945, following the Solomon Islands campaign, the Battle of the Philippine Sea and the Battle of Leyte Gulf, the once-formidable Imperial Japanese Navy's Combined Fleet was reduced to just a handful of operational warships and a few remaining aircraft and aircrew. Most of the remaining Japanese warships in the Combined Fleet were stationed at ports in Japan, with most of the large ships at the port of Kure in the Hiroshima Prefecture on the main Japanese island of Honshu. As a final step before the planned invasion of the Japanese home islands, Allied forces invaded Okinawa on 1 April 1945. In March, when briefing Emperor Hirohito on Japan's response to the expected invasion of Okinawa, Japanese military leaders explained that the Imperial Japanese Army was planning extensive air attacks, including the use of kamikaze tactics. The emperor then reportedly asked, "But what about the Navy? What are they doing to assist in defending Okinawa? Have we no more ships?" Feeling pressured by the emperor to mount some kind of attack, Japanese Navy commanders conceived a kamikaze-type mission for their remaining operational large ships, which included the battleship Yamato. The resulting plan, drafted under the direction of the Commander-in-Chief of the Combined Fleet, Admiral Soemu Toyoda, called for Yamato and her escorts to attack the U.S. fleet supporting troops landing on the western coast of Okinawa. Yamato and her escorts were to fight their way to Okinawa and then beach themselves between Higashi and Yomitan and fight as shore batteries until they were destroyed. Once the ships were destroyed, their surviving crew members were supposed to abandon ship and fight on land. Very little, if any, air cover could be provided for the ships, which would render them almost helpless to concentrated attacks from U.S. carrier-based aircraft. In preparation for executing the plan, on 29 March the assigned ships left Kure for Tokuyama, off the port of Mitajiri on the southern coast of Honshu. Despite obeying orders to prepare for the mission, the commander of the Ten-Go force, Vice-Admiral Seiichi Itō, still refused to actually order his ships to carry it out, believing the plan to be futile and wasteful. Other officers of the Imperial Japanese Navy also had very negative views about the operation, believing that it was a waste of human life and fuel. Captain Atsushi Ōi, an operations officer at Grand Escort Command, was critical as fuel and resources were diverted from other operations. As he was told that the aim of this operation was "the tradition and the glory of the Navy," he shouted: "this war is of our nation and why should the honor of our 'surface fleet' be more respected? Who cares about their glory? Damn fools!". Vice Admiral Ryūnosuke Kusaka flew from Tokyo to Tokuyama on 5 April in a final attempt to convince Itō and the assembled commanders of the Combined Fleet to accept the plan. Upon hearing of the proposed operation—which had been kept secret from most of them—the Combined Fleet commanders and captains unanimously joined Itō in rejecting it for the same reasons that he had expressed. Kusaka then explained that the Navy's attack would help divert U.S. aircraft away from the Army's planned kamikaze attacks on the U.S. fleet at Okinawa. He also explained that Japan's national leadership, including the emperor, were expecting the Navy to make their best effort to support the defense of Okinawa. Upon hearing this, the Combined Fleet commanders relented and accepted the proposed plan. The ships' crews were briefed on the nature of the mission and given the opportunity to stay behind if desired; none did. However, approximately 80 crew members who were new, sick, or infirm were ordered off the ships, including 67 naval cadets of Etajima Naval Academy Class No. 74 who had arrived on the battleship three days earlier. The ships' crews engaged in some last-minute intense drills to prepare for the mission, mostly practicing damage control procedures. At midnight, the ships were fueled. Reportedly, in secret defiance of orders to provide the ships with only just enough fuel to reach Okinawa, the Tokuyama personnel actually gave Yamato and the other ships almost all of the remaining fuel in the port, although this probably still was not enough to allow the force to return to Japan from Okinawa. Yamato's executive officer organised a party for the crew for the evening of 5 April, during which many of the officers and sailors drank heavily. The United States Navy was able to monitor preparations for Operation Ten-Go by decoding Japanese radio signals. Through this source, the Americans received conclusive intelligence on 5 and 6 April that the attack was to be attempted. Admiral Raymond Spruance, commander of the United States Fifth Fleet, ordered his forces to prepare to attack the Japanese at 00:30 on 6 April, before Yamato and her escorts sailed. Prelude At 16:00 on 6 April, Yamato (with Admiral Itō on board), the light cruiser Yahagi, and eight destroyers (Asashimo, Hamakaze, Isokaze, Suzutsuki, Hatsushimo, Yukikaze, Fuyutsuki, and Kasumi) departed Tokuyama to begin the mission. Two American submarines, Threadfin and Hackleback, sighted the Japanese force as it proceeded south through the Bungo Channel. Although they were unable to attack because of the ships' speed, they did spend several hours shadowing the Japanese sortie and sending updates on its course to the U.S. fleet. The submarines' messages, which were reportedly sent uncoded, were also picked up by radio operators on the Japanese ships. At dawn on 7 April, the Japanese force passed the Ōsumi Peninsula into the open ocean heading south from Kyūshū toward Okinawa. They shifted into a defensive formation, with Yahagi leading Yamato and the eight destroyers deployed in a ring around the two larger ships, with each ship 1,500 m (1,600 yd) from each other and proceeding at 20 kn (23 mph; 37 km/h). The destroyer Asashimo developed engine trouble and turned back. U.S. reconnaissance aircraf.... Discover the Ten Ichi popular books. Find the top 100 most popular Ten Ichi books.