''Teiyō Maru'' was an auxiliary fleet oiler of the

Imperial Japanese Navy The Imperial Japanese Navy (IJN; Kyūjitai: Shinjitai: ' 'Navy of the Greater Japanese Empire', or ''Nippon Kaigun'', 'Japanese Navy') was the navy of the Empire of Japan from 1868 to 1945, when it was dissolved following Japan's surrender ...

(IJN) during

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...

. She was converted from civilian service to a naval auxiliary as the

Pearl Harbor Pearl Harbor is an American lagoon harbor on the island of Oahu, Hawaii, west of Honolulu. It was often visited by the Naval fleet of the United States, before it was acquired from the Hawaiian Kingdom by the U.S. with the signing of the Re ...

attack force sailed; and participated in the major offensive operations of the first six months of

Pacific The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the continen ...

combat. She then served in the northern Pacific until July 1944, and was sunk in the battle for

convoy Hi-71 was one of the World War II Hi convoys of fast tankers and troop transports from Japan to Singapore. The heavily defended convoy was specially loaded with reinforcements for defense of the Philippines, and encountered a wolfpack of United Stat ...

when reassigned to the defense of the

Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...

History

''Teiyō Maru'' was completed as a civilian tanker in 1931 and requisitioned by the Navy as a

replenishment oiler A replenishment oiler or replenishment tanker is a naval auxiliary ship with fuel tanks and dry cargo holds which can supply both fuel and dry stores during underway replenishment (UNREP) at sea. Many countries have used replenishment oilers. The ...

on 22 November 1941. Yokohama Dock Company completed the conversion to a naval auxiliary on 4 December 1941. ''Teiyō Maru'' served with replenishment group no. 1 for the Java Invasion Force, and later with replenishment group no. 2 for the

Indian Ocean raid The Indian Ocean raid, also known as Operation C or Battle of Ceylon in Japanese, was a naval sortie carried out by the Imperial Japanese Navy (IJN) from 31 March to 10 April 1942. Japanese aircraft carriers under Admiral Chūichi Nagumo ...

, and with the

5th Fleet The Fifth Fleet is a numbered fleet of the United States Navy. It has been responsible for naval forces in the Persian Gulf, Red Sea, Arabian Sea, and parts of the Indian Ocean since 1995 after a 48-year hiatus. It shares a commander and headq ...

for the

Japanese occupation of Attu The Japanese occupation of Attu was the result of an invasion of the Aleutian Islands in Alaska during World War II. Imperial Japanese Army troops landed on 7 June 1942 the day after the invasion of Kiska. The invasions on Attu Island and Kiska ...

and

Kiska Kiska ( ale, Qisxa, russian: Кыска) is one of the Rat Islands, a group of the Aleutian Islands of Alaska. It is about long and varies in width from . It is part of Aleutian Islands Wilderness and as such, special permission is required ...

. ''Teiyō Maru'' was then converted for cold weather operations and served for two years as a replenishment oiler for ships between

Hokkaido is Japan's second largest island and comprises the largest and northernmost prefecture, making up its own region. The Tsugaru Strait separates Hokkaidō from Honshu; the two islands are connected by the undersea railway Seikan Tunnel. The la ...

and the

Aleutian Islands The Aleutian Islands (; ; ale, Unangam Tanangin,”Land of the Aleuts", possibly from Chukchi language, Chukchi ''aliat'', "island"), also called the Aleut Islands or Aleutic Islands and known before 1867 as the Catherine Archipelago, are a cha ...

. On 30 July 1944 ''Teiyō Maru'' was attached to convoy Hi-71 carrying Operation ''Shō'' reinforcements to the Philippines. The convoy sailed into the

South China Sea The South China Sea is a marginal sea of the Western Pacific Ocean. It is bounded in the north by the shores of South China (hence the name), in the west by the Indochinese Peninsula, in the east by the islands of Taiwan and northwestern Phil ...

from

Mako , better known by the mononym name Mako (sometimes stylised MAKO), is a Japanese voice actress, singer and a member of the band Bon-Bon Blanco, in which her prominent role is as the maraca player. She has also performed in a Japanese television d ...

naval base in the

Pescadores The Penghu (, Hokkien Pe̍h-ōe-jī, POJ: ''Phîⁿ-ô͘'' or ''Phêⁿ-ô͘'' ) or Pescadores Islands are an archipelago of 90 islands and islets in the Taiwan Strait, located approximately west from the main island of Taiwan, cov ...

on 17 August, and was discovered that evening by . ''Redfish'' assembled , and for a

radar Radar is a detection system that uses radio waves to determine the distance (''ranging''), angle, and radial velocity of objects relative to the site. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, w ...

-assisted wolfpack attack in

typhoon A typhoon is a mature tropical cyclone that develops between 180° and 100°E in the Northern Hemisphere. This region is referred to as the Northwestern Pacific Basin, and is the most active tropical cyclone basin on Earth, accounting for a ...

conditions on the night of 18/19 August. ''Teiyō Maru'' was one of several ships torpedoed that night; and 41 crewmen and 58 passengers perished when she sank at .

References

{{DEFAULTSORT:Teiyo Maru World War II naval ships of Japan Auxiliary ships of the Imperial Japanese Navy World War II tankers Ships of the Aleutian Islands campaign Ships sunk by American submarines 1931 ships Oilers