was a large

minelayer A minelayer is any warship, submarine or military aircraft deploying explosive mines. Since World War I the term "minelayer" refers specifically to a naval ship used for deploying naval mines. "Mine planting" was the term for installing controll ...

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 ...

that was in service during the early stages of

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 named after the

Tsugaru Peninsula The is a peninsula in Aomori Prefecture, at the northern end of Honshū island, Japan. The peninsula projects north into the Tsugaru Strait separating Honshū from Hokkaidō. The western coast is on the Sea of Japan, while on its eastern coast ...

in northwest

Aomori Prefecture is a prefecture of Japan in the Tōhoku region. The prefecture's capital, largest city, and namesake is the city of Aomori. Aomori is the northernmost prefecture on Japan's main island, Honshu, and is bordered by the Pacific Ocean to the east, ...

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

. She was commissioned immediately before the start of

, and sunk by the American submarine USS Darter in June 1944.

Building

Under the ''Maru-3'' Supplementary Naval Expansion Budget of 1937, a new large minelayer incorporating design improvements realized through operational experience with was funded. In addition to carrying 600 Type 6

naval mine A naval mine is a self-contained explosive device placed in water to damage or destroy surface ships or submarines. Unlike depth charges, mines are deposited and left to wait until they are triggered by the approach of, or contact with, any ...

s, the new ship was equipped with an

aircraft catapult An aircraft catapult is a device used to allow aircraft to take off from a very limited amount of space, such as the deck of a vessel, but can also be installed on land-based runways in rare cases. It is now most commonly used on aircraft carrier ...

, and carried a

Kawanishi E7K The Kawanishi E7K was a Japanese three-seat reconnaissance seaplane mainly in use during the 1930s. It was allocated the reporting name Alf by the Allies of World War II. Design and development In 1932 the Imperial Japanese Navy requested the K ...

reconnaissance seaplane. Physically very similar to ''Okinoshima'' in size, appearance and layout, its main armament was changed to four 127 mm Type 89

dual purpose gun A dual-purpose gun is a naval artillery mounting designed to engage both surface and air targets. Description Second World War-era capital ships had four classes of artillery: the heavy main battery, intended to engage opposing battleships and ...

s, intended to give ''Tsugaru'' better AA capabilities than its predecessor. ''Tsugaru'' was launched by the

Yokosuka Naval Arsenal was one of four principal naval shipyards owned and operated by the Imperial Japanese Navy, and was located at Yokosuka, Kanagawa prefecture on Tokyo Bay, south of Yokohama. History In 1866, the Tokugawa shogunate government established the ...

on 5 June 1940, and was commissioned into service on 22 October 1941.

Operational history

After commissioning, ''Tsugaru'' was assigned to Admiral

Kiyohide Shima was an admiral in the Imperial Japanese Navy during World War II. Biography A native of Miyazaki prefecture, Shima was a graduate of the 39th class of the Imperial Japanese Naval Academy in 1911, ranking 69th out of 148 cadets. As a midshipman, h ...

’s Mine Division 19 under Admiral

Shigeyoshi Inoue was an admiral in the Imperial Japanese Navy during World War II. He was commander of the Japanese 4th Fleet and later served as Vice-Minister of the Navy. A noted naval theorist, he was a strong advocate of naval aviation within the Japanese N ...

’s IJN 4th Fleet and was forward deployed to

Saipan Saipan ( ch, Sa’ipan, cal, Seipél, formerly in es, Saipán, and in ja, 彩帆島, Saipan-tō) is the largest island of the Northern Mariana Islands, a Commonwealth (U.S. insular area), commonwealth of the United States in the western Pa ...

. At the time of the

attack on Pearl Harbor The attack on Pearl HarborAlso known as the Battle of Pearl Harbor was a surprise military strike by the Imperial Japanese Navy Air Service upon the United States against the naval base at Pearl Harbor in Honolulu, Territory of Hawaii, j ...

in December 1941, ''Tsugaru'' was assigned to support the invasion of Guam. Following the success of this mission, in January 1942, ''Tsugaru'' deployed from

Jaluit Jaluit Atoll ( Marshallese: , , or , ) is a large coral atoll of 91 islands in the Pacific Ocean and forms a legislative district of the Ralik Chain of the Marshall Islands. Its total land area is , and it encloses a lagoon with an area of . Mo ...

together with ''Okinoshima'', under the overall command of Admiral

Sadamichi Kajioka was an admiral in the Imperial Japanese Navy during World War II. He directed Japanese forces involved in the Battle of Wake Island. Biography A native of Ehime prefecture, Kajioka graduated from the 39th class of the Imperial Japanese Naval Ac ...

to participate in “Operation R” (the invasion of

Rabaul Rabaul () is a township in the East New Britain province of Papua New Guinea, on the island of New Britain. It lies about 600 kilometres to the east of the island of New Guinea. Rabaul was the provincial capital and most important settlement in ...

and

Kavieng Kavieng is the capital of the Papua New Guinean province of New Ireland and the largest town on the island of the same name. The town is located at Balgai Bay, on the northern tip of the island. As of 2009, it had a population of 17,248. Kavi ...

). On 5 March, ''Tsugaru'' and ''Okinoshima'', under the overall command of Admiral

Kuninori Marumo , was an admiral in the Imperial Japanese Navy during World War II. Biography Marumo was a native of Nagano prefecture. He graduated from the 40th class of the Imperial Japanese Naval Academy in 1912, ranked 47th out of 144 cadets. As a midsh ...

, were assigned to “Operation SR” (the invasion of

Lae Lae () is the capital of Morobe Province and is the second-largest city in Papua New Guinea. It is located near the delta of the Markham River and at the start of the Highlands Highway, which is the main land transport corridor between the Highl ...

and

Salamaua Salamaua () was a small town situated on the northeastern coastline of Papua New Guinea, in Salamaua Rural LLG, Morobe province. The settlement was built on a minor isthmus between the coast with mountains on the inland side and a headland. The c ...

New Guinea New Guinea (; Hiri Motu Hiri Motu, also known as Police Motu, Pidgin Motu, or just Hiri, is a language of Papua New Guinea, which is spoken in surrounding areas of Port Moresby (Capital of Papua New Guinea). It is a simplified version of ...

). On 10 March, the invasion force was attacked by ninety

United States Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage ...

aircraft from and with ''Tsugaru'' suffering light damage. On 4 May ''Tsugaru'' was assigned to Admiral Shima's Tulagi invasion force, which was part of “

Operation Mo or the Port Moresby Operation was a Japanese plan to take control of the Australian Territory of New Guinea during World War II as well as other locations in the South Pacific. The goal was to isolate Australia and New Zealand from the Allied ...

” (the invasion of

Tulagi Tulagi, less commonly known as Tulaghi, is a small island——in Solomon Islands, just off the south coast of Ngella Sule. The town of the same name on the island (pop. 1,750) was the capital of the British Solomon Islands Protectorate from 18 ...

and

Port Moresby (; Tok Pisin: ''Pot Mosbi''), also referred to as Pom City or simply Moresby, is the capital and largest city of Papua New Guinea. It is one of the largest cities in the southwestern Pacific (along with Jayapura) outside of Australia and New Z ...

). However, the invasion plans were cancelled after the

Battle of the Coral Sea The Battle of the Coral Sea, from 4 to 8 May 1942, was a major naval battle between the Imperial Japanese Navy (IJN) and naval and air forces of the United States and Australia. Taking place in the Pacific Theatre of World War II, the batt ...

and ''Tsugaru'' was assigned instead to “ Operation RY" (the invasion of

Nauru Nauru ( or ; na, Naoero), officially the Republic of Nauru ( na, Repubrikin Naoero) and formerly known as Pleasant Island, is an island country and microstate in Oceania, in the Central Pacific. Its nearest neighbour is Banaba Island in Ki ...

and Ocean Island). This operation was also cancelled after the loss of ''Okinoshima'' on 12 May 1942, and ''Tsugaru'' was stationed at

. On 14 July, ''Tsugaru'' was reassigned to Admiral

Gunichi Mikawa was a vice-admiral in the Imperial Japanese Navy (IJN) during World War II. Mikawa was the commander of a heavy cruiser force that won a spectacular IJN victory over the U.S. Navy and the Royal Australian Navy at the Battle of Savo Island in Ir ...

’s IJN 8th Fleet, and supported “Operation RI” (the invasion of Buna in New Guinea). Subsequently, in August and September, ''Tsugaru'' was used on missions to supply reinforcements and equipment to

Guadalcanal Guadalcanal (; indigenous name: ''Isatabu'') is the principal island in Guadalcanal Province of Solomon Islands, located in the south-western Pacific, northeast of Australia. It is the largest island in the Solomon Islands by area, and the seco ...

, and was hit by bombs from

USAAF The United States Army Air Forces (USAAF or AAF) was the major land-based aerial warfare service component of the United States Army and ''de facto'' aerial warfare service branch of the United States during and immediately after World War II ...

B-17 Flying Fortress The Boeing B-17 Flying Fortress is a four-engined heavy bomber developed in the 1930s for the United States Army Air Corps (USAAC). Relatively fast and high-flying for a bomber of its era, the B-17 was used primarily in the European Theater ...

bombers on 3 September, with 14 crewmen killed and 30 wounded. After repairs, she continued making transport runs to Guadalcanal,

Shortland Island Shortland Island (once known as ''Alu'') is the largest island of the Shortland Islands archipelago, in the Western Province of the Solomon Islands, at . The original name was a Melanesian word, while the current name was given to the island b ...

New Georgia New Georgia, with an area of , is the largest of the islands in Western Province, Solomon Islands, and the 200th-largest island in the world. Geography New Georgia island is located in the New Georgia Group, an archipelago including most of ...

and

Santa Isabel Island Santa Isabel Island (also known as Isabel, Ysabel and Mahaga) is the longest in Solomon Islands, the third largest in terms of surface area, and the largest in the group of islands in Isabel Province. Location and geographic data Choiseul lies t ...

in the

Solomon Islands Solomon Islands is an island country consisting of six major islands and over 900 smaller islands in Oceania, to the east of Papua New Guinea and north-west of Vanuatu. It has a land area of , and a population of approx. 700,000. Its capita ...

to the end of February 1943. From March–May 1943, ''Tsugaru'' underwent repairs and refit at Yokosuka Naval Arsenal, returning to Rabaul in early August. However, en route to Rabaul, she was attacked by , on 5 August, NNE of Rabaul, with one torpedo hit. The damage was enough to warrant an immediate return to Truk for emergency repairs, and a return to Yokosuka by mid-September, where she remained to the end of the year. On 1 December 1943, ''Tsugaru'' was reassigned to the Third Southern Expeditionary Fleet. On 24 March 1944, she deployed from

Palau Palau,, officially the Republic of Palau and historically ''Belau'', ''Palaos'' or ''Pelew'', is an island country and microstate in the western Pacific. The nation has approximately 340 islands and connects the western chain of the Caro ...

to mine the

Balabac Strait The Balabac Strait ( fil, Kipot ng Balabak; ms, Selat Balabak) is one of the straits that connects the South China Sea with the Sulu Sea. It separates Balabac Island (Palawan province), Philippines, from Balambangan and the Banggi Islands nor ...

in the Philippines, after which she was stationed at

Balikpapan Balikpapan is a seaport city in East Kalimantan, Indonesia. Located on the east coast of the island of Borneo, the city is the financial center of Kalimantan. Balikpapan is the city with the largest economy in Kalimantan with an estimated 2 ...

Borneo Borneo (; id, Kalimantan) is the third-largest island in the world and the largest in Asia. At the geographic centre of Maritime Southeast Asia, in relation to major Indonesian islands, it is located north of Java, west of Sulawesi, and eas ...

. One of the mines from this mission is credited with sinking the , in July 1944. On 31 May, ''Tsugaru'' was assigned to “Operation KON” (the Relief of

Biak Biak is an island located in Cenderawasih Bay near the northern coast of Papua (province), Papua, an Indonesian province, and is just northwest of New Guinea. Biak is the largest island in its small archipelago, and has many atolls, reefs, and c ...

), transporting reinforcements from Zamboanga on

Mindanao Mindanao ( ) ( Jawi: مينداناو) is the second-largest island in the Philippines, after Luzon, and seventh-most populous island in the world. Located in the southern region of the archipelago, the island is part of an island group of ...

in an effort to counter the American landings. On 21 June, after departing

Sorong Sorong is the largest city and the capital of the Indonesian province of Southwest Papua. The city is located on the western tip of the island of New Guinea with its only land borders being with Sorong Regency. It is the gateway to Indonesia's ...

, New Guinea for

Halmahera Island Halmahera, formerly known as Jilolo, Gilolo, or Jailolo, is the largest island in the Maluku Islands. It is part of the North Maluku province of Indonesia, and Sofifi, the capital of the province, is located on the west coast of the island. Ha ...

, ''Tsugaru'' was torpedoed by the

Royal Dutch Navy The Royal Netherlands Navy ( nl, Koninklijke Marine, links=no) is the naval force of the Kingdom of the Netherlands. During the 17th century, the navy of the Dutch Republic (1581–1795) was one of the most powerful naval forces in the world an ...

submarine ''K-XIV'', which caused severe damage. After temporary repairs, she attempted to reach

Manila Manila ( , ; fil, Maynila, ), officially the City of Manila ( fil, Lungsod ng Maynila, ), is the capital of the Philippines, and its second-most populous city. It is highly urbanized and, as of 2019, was the world's most densely populate ...

, but was sighted on 29 June near Biak by , which fired a full spread of six torpedoes. Two hit ''Tsugaru'', which sank at position less than 25 minutes later with loss of most of her crew, including her CO, Captain Nakatsu. ''Tsugaru'' was removed from the

navy list A Navy Directory, formerly the Navy List or Naval Register is an official list of naval officers, their ranks and seniority, the ships which they command or to which they are appointed, etc., that is published by the government or naval autho ...

on 10 August 1944.

References

Notes

Books

* * * * *

External links

* {{DEFAULTSORT:Tsugaru Minelayers of the Imperial Japanese Navy World War II mine warfare vessels of Japan Ships built by Yokosuka Naval Arsenal 1940 ships Maritime incidents in June 1944 World War II shipwrecks in the Molucca Sea Ships sunk by American submarines