Japanese cruiser Oi
Encyclopedia
was the fourth of five Kuma-class
Kuma class cruiser
-See also:*List of World War II ships...

 light cruiser
Light cruiser
A light cruiser is a type of small- or medium-sized warship. The term is a shortening of the phrase "light armored cruiser", describing a small ship that carried armor in the same way as an armored cruiser: a protective belt and deck...

s, which served in the Imperial Japanese Navy
Imperial Japanese Navy
The Imperial Japanese Navy was the navy of the Empire of Japan from 1869 until 1947, when it was dissolved following Japan's constitutional renunciation of the use of force as a means of settling international disputes...

 during World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

. She was named after the Oi River
Oi River
The is a river in Shizuoka Prefecture, Japan.-Geography:The Ōi River flows from the Akaishi Mountains, the branch of the Japanese Southern Alps which form the border between Shizuoka, Nagano and Yamanashi prefectures. These mountains, with peaks ranging from 2000–3000 meters, are characterized by...

 in Shizuoka prefecture
Shizuoka Prefecture
is a prefecture of Japan located in the Chūbu region on Honshu island. The capital is the city of Shizuoka.- History :Shizuoka prefecture was formed from the former Tōtōmi, Suruga and Izu provinces.The area was the home of the first Tokugawa Shogun...

, Japan
Japan
Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

.

Background

As with her sister ship
Sister ship
A sister ship is a ship of the same class as, or of virtually identical design to, another ship. Such vessels share a near-identical hull and superstructure layout, similar displacement, and roughly comparable features and equipment...

s, Ōi was intended for use both as a long-range, high-speed scout ship and also as a command vessel for destroyer
Destroyer
In naval terminology, a destroyer is a fast and maneuverable yet long-endurance warship intended to escort larger vessels in a fleet, convoy or battle group and defend them against smaller, powerful, short-range attackers. Destroyers, originally called torpedo-boat destroyers in 1892, evolved from...

 or submarine
Submarine
A submarine is a watercraft capable of independent operation below the surface of the water. It differs from a submersible, which has more limited underwater capability...

 flotilla
Flotilla
A flotilla , or naval flotilla, is a formation of small warships that may be part of a larger fleet. A flotilla is usually composed of a homogeneous group of the same class of warship, such as frigates, destroyers, torpedo boats, submarines, gunboats, or minesweepers...

s.

Early career

Ōi was completed at Kawasaki Heavy Industries
Kawasaki Heavy Industries
is an international corporation based in Japan. It has headquarters in both Chūō-ku, Kobe and Minato, Tokyo.The company is named after its founder Shōzō Kawasaki and has no connection with the city of Kawasaki, Kanagawa....

 shipyards at Kobe
Kobe
, pronounced , is the fifth-largest city in Japan and is the capital city of Hyōgo Prefecture on the southern side of the main island of Honshū, approximately west of Osaka...

 on 4 May 1921. From 1928-1931, she was assigned to be a training vessel at the Imperial Japanese Navy Academy in Etajima, Hiroshima
Etajima, Hiroshima
is a city located on the island of Etajima in Hiroshima Bay in southwestern Hiroshima, Japan.The city was formed on November 1, 2004 from the merger of the town of Etajima from Aki District with three towns from Saeki District: Nōmi, Ōgaki, and Okimi.As of March 1, 2008 population data, the city...

. At the time of the Shanghai Incident of 1937, Ōi was re-assigned to patrols of the China
China
Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

 coast, but it resumed its training role from the end of 1933 to mid-1937. After August 1937, as the Second Sino-Japanese War
Second Sino-Japanese War
The Second Sino-Japanese War was a military conflict fought primarily between the Republic of China and the Empire of Japan. From 1937 to 1941, China fought Japan with some economic help from Germany , the Soviet Union and the United States...

 continued to escalate, Ōi was assigned to cover the landings of Japanese forces in central China, but it was again assigned to training duties from December 1937 through the end of 1939.

On 25 August 1941, Ōi returned to Maizuru
Maizuru, Kyoto
is a city located in Kyōto, Japan, on an inlet of the Sea of Japan.As of 2008, the city has an estimated population of 89,626 and the density of 264 persons per km². The total area is .The city was founded on May 27, 1943....

 for conversion to a "torpedo cruiser" with 10 Type 92 Model 3 quadruple mount 1-cm torpedo tube launchers
Type 92 torpedo
The Type 92 torpedo was a submarine-launched torpedo used by the Imperial Japanese Navy during World War II. It was in length and 21 inches in diameter. This type of torpedo was battery powered. It could deliver a 660 pound warhead at 30 knots to a target 7 kilometers away....

 (a total of 40 tubes), housing long-range oxygen-propelled Type 93 “Long Lance” torpedoes arranged in two broadside rows of five, i.e. 20 per side. Modifications were completed 30 September, and Ōi was assigned to the First Fleet, CruDiv 9 under Rear Admiral
Rear Admiral
Rear admiral is a naval commissioned officer rank above that of a commodore and captain, and below that of a vice admiral. It is generally regarded as the lowest of the "admiral" ranks, which are also sometimes referred to as "flag officers" or "flag ranks"...

 Fukuji Kishi together with her sister .

Early stages of the Pacific War

During the attack on Pearl Harbor
Attack on Pearl Harbor
The attack on Pearl Harbor was a surprise military strike conducted by the Imperial Japanese Navy against the United States naval base at Pearl Harbor, Hawaii, on the morning of December 7, 1941...

 of 7 December 1941, Ōi escorted the battleship
Battleship
A battleship is a large armored warship with a main battery consisting of heavy caliber guns. Battleships were larger, better armed and armored than cruisers and destroyers. As the largest armed ships in a fleet, battleships were used to attain command of the sea and represented the apex of a...

 force of the Combined Fleet
Combined Fleet
The was the main ocean-going component of the Imperial Japanese Navy. The Combined Fleet was not a standing force, but a temporary force formed for the duration of a conflict or major naval maneuvers from various units normally under separate commands in peacetime....

 from its anchorage at Hashirajima
Hashirajima
is an island in southern Hiroshima Bay of the Inland Sea, Yamaguchi Prefecture, Japan. Located 26 kilometers southeast of Iwakuni, it is part of the Kutsuna Islands within the Bōyō Islands group....

 in Hiroshima
Hiroshima
is the capital of Hiroshima Prefecture, and the largest city in the Chūgoku region of western Honshu, the largest island of Japan. It became best known as the first city in history to be destroyed by a nuclear weapon when the United States Army Air Forces dropped an atomic bomb on it at 8:15 A.M...

 Bay to the Bonin Islands and back.

On 12 January 1942, Chief of Staff Rear Admiral Matome Ugaki inspected Ōi, and expressed strong disapproval of the Navy's plans for the use of the newly remodeled torpedo cruisers and urged a revision to the Navy's tactics. While the Imperial Japanese Navy General Staff
Imperial Japanese Navy General Staff
The was the highest organ within the Imperial Japanese Navy. In charge of planning and operations, it was headed by an Admiral headquartered in Tokyo.-History:...

 debated the issue, Ōi was assigned to escorting transports between Hiroshima
Hiroshima
is the capital of Hiroshima Prefecture, and the largest city in the Chūgoku region of western Honshu, the largest island of Japan. It became best known as the first city in history to be destroyed by a nuclear weapon when the United States Army Air Forces dropped an atomic bomb on it at 8:15 A.M...

 and Mako
Makung
Makung is the county seat of Penghu, in Taiwan Province, Taiwan . Makung is on the western part of the main Penghu Island....

, Pescadores Islands from the end of January through mid-April.

On 29 May, during the Battle of Midway
Battle of Midway
The Battle of Midway is widely regarded as the most important naval battle of the Pacific Campaign of World War II. Between 4 and 7 June 1942, approximately one month after the Battle of the Coral Sea and six months after Japan's attack on Pearl Harbor, the United States Navy decisively defeated...

, Ōi was part of Vice Admiral
Vice Admiral
Vice admiral is a senior naval rank of a three-star flag officer, which is equivalent to lieutenant general in the other uniformed services. A vice admiral is typically senior to a rear admiral and junior to an admiral...

 Takasu's (Aleutian Screening) force, and returned safely to Yokosuka
Yokosuka, Kanagawa
is a city located in Kanagawa, Japan. As of 2010, the city had an estimated population of 419,067 and a population density of 4,160 people per km². It covered an area of 100.62 km²...

 on 17 June.

As a fast transport

From August–September, Ōi and Kitakami were converted into fast transports. Their ten quadruple torpedo tubes were reduced to six, for a total of 24 tubes. They were equipped with two Daihatsu landing craft
Landing craft
Landing craft are boats and seagoing vessels used to convey a landing force from the sea to the shore during an amphibious assault. Most renowned are those used to storm the beaches of Normandy, the Mediterranean, and many Pacific islands during WWII...

 (barges) and fitted with two triple-mount Type 96 25-mm AA guns. Depth charge
Depth charge
A depth charge is an anti-submarine warfare weapon intended to destroy or cripple a target submarine by the shock of exploding near it. Most use explosives and a fuze set to go off at a preselected depth in the ocean. Depth charges can be dropped by either surface ships, patrol aircraft, or from...

 launching rails were also installed. Ōi was then used to transport the Maizuru No. 4 Special Naval Landing Force to Truk in the Caroline Islands
Caroline Islands
The Caroline Islands are a widely scattered archipelago of tiny islands in the western Pacific Ocean, to the north of New Guinea. Politically they are divided between the Federated States of Micronesia in the eastern part of the group, and Palau at the extreme western end...

.

From the end of October through most of December, Ōi ferried troops and supplies from Truk and Manila
Manila
Manila is the capital of the Philippines. It is one of the sixteen cities forming Metro Manila.Manila is located on the eastern shores of Manila Bay and is bordered by Navotas and Caloocan to the north, Quezon City to the northeast, San Juan and Mandaluyong to the east, Makati on the southeast,...

 to Rabaul
Rabaul
Rabaul is a township in East New Britain province, Papua New Guinea. The town was the provincial capital and most important settlement in the province until it was destroyed in 1994 by falling ash of a volcanic eruption. During the eruption, ash was sent thousands of metres into the air and the...

, New Britain
New Britain
New Britain, or Niu Briten, is the largest island in the Bismarck Archipelago of Papua New Guinea. It is separated from the island of New Guinea by the Dampier and Vitiaz Straits and from New Ireland by St. George's Channel...

 and Buin
Buin, Papua New Guinea
Buin is a settlement at the southern end of the island of Bougainville, a part of the North Solomons Province, located in the northern Solomon Islands in the South Pacific Ocean.-History:...

, Bougainville
Bougainville Island
Bougainville Island is the main island of the Autonomous Region of Bougainville of Papua New Guinea. This region is also known as Bougainville Province or the North Solomons. The population of the province is 175,160 , which includes the adjacent island of Buka and assorted outlying islands...

. On 21 November, CruDiv 9 was disbanded and Ōi was assigned directly to the Combined Fleet. On 24 December, Ōi returned to Kure
Kure, Hiroshima
is a city in Hiroshima prefecture, Japan.As of October 1, 2010, the city has an estimated population of 240,820 and a population density of 681 persons per km². The total area is 353.74 km².- History :...

 for maintenance.

From 12 January 1943, Ōi participated in the operation to reinforce Japanese forces in New Guinea
New Guinea
New Guinea is the world's second largest island, after Greenland, covering a land area of 786,000 km2. Located in the southwest Pacific Ocean, it lies geographically to the east of the Malay Archipelago, with which it is sometimes included as part of a greater Indo-Australian Archipelago...

. It ferried a convoy with IJA's 20th Infantry Division
20th Division (Imperial Japanese Army)
was an infantry division in the Imperial Japanese Army. Its call sign was the .-History:The 20th Division and the 19th Division were raised on 24 December 1915 as a garrison force for Korea. After Japan's victory in the Russo-Japanese War, and subsequent occupation, and then annexation of Korea,...

 from Pusan to Wewak
Wewak
Wewak is the capital of the East Sepik province of Papua New Guinea. It is located on the northern coast of the island of New Guinea. It is the largest town between Madang and Jayapura. It is the see city of the Roman Catholic Diocese of Wewak....

, New Guinea via Palau
Palau
Palau , officially the Republic of Palau , is an island nation in the Pacific Ocean, east of the Philippines and south of Tokyo. In 1978, after three decades as being part of the United Nations trusteeship, Palau chose independence instead of becoming part of the Federated States of Micronesia, a...

 in January, and a convoy with IJA's 41st Infantry Division
41st Division (Imperial Japanese Army)
The 41st Division was an infantry division of the Imperial Japanese Army. It was formed on 2 October 1939, under the command of Lieutenant General Moritake Tanabe...

 from Tsingtao to Wewak in February.

On 15 March, Ōi was assigned to Admiral Shiro Takasu
Shirō Takasu
Admiral was a career naval officer in the Imperial Japanese Navy during World War II.-Biography:Takasu was a native of Sakuragawa Village, , and graduated from the 35th class of the Imperial Japanese Naval Academy, where his classmates included future admirals Nobutake Kondō and Naokuni Nomura...

's Southwest Area Fleet and was assigned to escort two convoys from Surabaya
Surabaya
Surabaya is Indonesia's second-largest city with a population of over 2.7 million , and the capital of the province of East Java...

 to Kaimana
Kaimana
Kaimana is a small port town in West Papua, Indonesia and capital of the Kaimana Regency.It is served by Kaimana Airport. Kaimana is part of a Sea Conservation Area in West Papua.Butterflies in the surrounding forest of Karora are reported to be on the brink of extinction due to logging in the...

, New Guinea in April, and from Surabaya to Ambon
Ambon Island
Ambon Island is part of the Maluku Islands of Indonesia. The island has an area of , and is mountainous, well watered, and fertile. Ambon Island consists of 2 territories: The main city and seaport is Ambon , which is also the capital of Maluku province and Maluku Tengah Ambon Island is part of the...

 and Kaimana in May. While at Makassar
Makassar
Makassar, is the provincial capital of South Sulawesi, Indonesia, and the largest city on Sulawesi Island. From 1971 to 1999, the city was named Ujung Pandang, after a precolonial fort in the city, and the two names are often used interchangeably...

 on 23 June, she was attacked by Consolidated Aircraft
Consolidated Aircraft
The Consolidated Aircraft Corporation was founded in 1923 by Reuben H. Fleet, the result of the Gallaudet Aircraft Company's liquidation and Fleet's purchase of designs from the Dayton-Wright Company as the subsidiary was being closed by its parent corporation, General Motors. Consolidated became...

 B-24 Liberator
B-24 Liberator
The Consolidated B-24 Liberator was an American heavy bomber, designed by Consolidated Aircraft of San Diego, California. It was known within the company as the Model 32, and a small number of early models were sold under the name LB-30, for Land Bomber...

s of the 5th Air Force's 319th Bombardment Squadron, but was not damaged.

On 1 July, Ōi was assigned to CruDiv 16 of the Southwest Area Fleet, and was based at Surabaya as a guard ship. After patrols in the Java Sea
Java Sea
The Java Sea is a large shallow sea on the Sunda Shelf. It was formed as sea levels rose at the end of the last ice age. The Java Sea lies between the Indonesian islands of Borneo to the north, Java to the south; Sumatra to the west, and Sulawesi to the east...

, she was repaired at Seletar Naval Base
Seletar
Seletar is an area of Singapore within its North-East Region. Seletar commonly refers to the areas south of Yishun and west of Sungei Punggol, covering Yio Chu Kang near Jalan Kayu , the Lower Seletar Reservoir and part of Upper Thomson .The Seletar Planning Area, an urban planning zone under the...

, Singapore
Singapore
Singapore , officially the Republic of Singapore, is a Southeast Asian city-state off the southern tip of the Malay Peninsula, north of the equator. An island country made up of 63 islands, it is separated from Malaysia by the Straits of Johor to its north and from Indonesia's Riau Islands by the...

 in August.

Operations in the Indian Ocean

From the end of August 1943 to the end of January 1944, Ōi and Kitakami made four troop transport runs from Singapore and Penang
Penang
Penang is a state in Malaysia and the name of its constituent island, located on the northwest coast of Peninsular Malaysia by the Strait of Malacca. It is bordered by Kedah in the north and east, and Perak in the south. Penang is the second smallest Malaysian state in area after Perlis, and the...

 to the Andaman Islands
Andaman Islands
The Andaman Islands are a group of Indian Ocean archipelagic islands in the Bay of Bengal between India to the west, and Burma , to the north and east...

 and Nicobar Islands
Nicobar Islands
The Nicobar Islands are an archipelagic island chain in the eastern Indian Ocean...

.

From 27 February, Ōi — with light cruiser and destroyers , and — was assigned to escort the heavy cruisers , and for commerce raiding
Commerce raiding
Commerce raiding or guerre de course is a form of naval warfare used to destroy or disrupt the logistics of an enemy on the open sea by attacking its merchant shipping, rather than engaging the combatants themselves or enforcing a blockade against them.Commerce raiding was heavily criticised by...

 in the Indian Ocean
Indian Ocean
The Indian Ocean is the third largest of the world's oceanic divisions, covering approximately 20% of the water on the Earth's surface. It is bounded on the north by the Indian Subcontinent and Arabian Peninsula ; on the west by eastern Africa; on the east by Indochina, the Sunda Islands, and...

, but in general remained in the vicinity of Singapore and Balikpapan
Balikpapan
Balikpapan is a seaport city on the eastern coast of the island of Borneo, Indonesia, in the East Kalimantan province, a resource-rich region well known for its timber, mining, and petroleum export products. Two harbors, Semayang and Kariangau , and the Sepinggan International Airport are the main...

 and Tarakan
Tarakan Island
Tarakan is an island off the coast of East Kalimantan, Indonesia. It is a marshy island situated in the eastern Celebes Sea, off the northeastern coast of Borneo. The island occupies an area of .-Petroleum:...

 in Borneo
Borneo
Borneo is the third largest island in the world and is located north of Java Island, Indonesia, at the geographic centre of Maritime Southeast Asia....

 until the end of April. During the month of May, Ōi was primarily involved in troop transport operations between Tarakan, Palau and Sorong
Sorong
Sorong is a chartered coastal city in the eastern Indonesian province of West Papua. Its only land borders are with Sorong Regency. It is the gateway to Indonesia's Raja Ampat Islands, species rich coral reef islands in an area considered the heart of the world's coral reef biodiversity. It also...

, and in June she was re-assigned to patrols in the Java Sea.

On 6 July, Ōi departed Surabaya for Manila
Manila
Manila is the capital of the Philippines. It is one of the sixteen cities forming Metro Manila.Manila is located on the eastern shores of Manila Bay and is bordered by Navotas and Caloocan to the north, Quezon City to the northeast, San Juan and Mandaluyong to the east, Makati on the southeast,...

. On 19 July, she was sighted in the South China Sea
South China Sea
The South China Sea is a marginal sea that is part of the Pacific Ocean, encompassing an area from the Singapore and Malacca Straits to the Strait of Taiwan of around...

, 570 nmi (1,055.6 km; 655.9 mi) south of Hong Kong
Hong Kong
Hong Kong is one of two Special Administrative Regions of the People's Republic of China , the other being Macau. A city-state situated on China's south coast and enclosed by the Pearl River Delta and South China Sea, it is renowned for its expansive skyline and deep natural harbour...

 by the United States Navy
United States Navy
The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

 submarine
Submarine
A submarine is a watercraft capable of independent operation below the surface of the water. It differs from a submersible, which has more limited underwater capability...

 . When the cruiser was 1400 yd (1,280.2 m) astern, Flasher fired her four stern
Stern
The stern is the rear or aft-most part of a ship or boat, technically defined as the area built up over the sternpost, extending upwards from the counter rail to the taffrail. The stern lies opposite of the bow, the foremost part of a ship. Originally, the term only referred to the aft port section...

 tubes, hitting Ōi with two torpedoes portside aft. One was a dud, but the other torpedo exploded and flooded Ōi's aft engine room
Engine room
On a ship, the engine room, or ER, commonly refers to the machinery spaces of a vessel. To increase the safety and damage survivability of a vessel, the machinery necessary for operations may be segregated into various spaces, the engine room is one of these spaces, and is generally the largest...

. Flasher then fired four bow
Bow (ship)
The bow is a nautical term that refers to the forward part of the hull of a ship or boat, the point that is most forward when the vessel is underway. Both of the adjectives fore and forward mean towards the bow...

torpedoes from 3500 yd (3,200.4 m), but all missed. At 17:25, Ōi sank by the stern at 13°12′N 114°52′E. Shikinami rescued Captain Shiba and 368 crewmen, but another 153 crewmen went down with the ship.

Ōi was removed from the Navy List on 10 September 1944.

External links

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