was an aircraft and airbase garrison unit of the Imperial Japanese Navy Air Service

Imperial Japanese Navy Air Service

The Imperial Japanese Navy Air Service was the air arm of the Imperial Japanese Navy during World War II, the organization was responsible for the operation of naval aircraft and the conduct of aerial warfare in the Pacific War.It was controlled by the Navy Staff of the Imperial Japanese Navy and...

 during 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...

 and Pacific campaign

Pacific War

The Pacific War, also sometimes called the Asia-Pacific War refers broadly to the parts of World War II that took place in the Pacific Ocean, its islands, and in East Asia, then called the Far East...

 of 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...

.

History

The Genzan Air Group was founded on 15 November 1940 at Genzan

Wonsan

Wŏnsan is a port city and naval base in southeastern North Korea. It is the capital of Kangwŏn Province. The population of the city is estimated to have been 331,000 in 2000. Notable people from Wŏnsan include Kim Ki Nam, diplomat and Secretary of the Workers' Party.- History :The original name of...

, Korea

Korea under Japanese rule

Korea was under Japanese rule as part of Japan's 35-year imperialist expansion . Japanese rule ended in 1945 shortly after the Japanese defeat in World War II....

, then a part of the Empire of Japan

Empire of Japan

The Empire of Japan is the name of the state of Japan that existed from the Meiji Restoration on 3 January 1868 to the enactment of the post-World War II Constitution of...

. It was initially a mixed-unit equipped with 33 Type 96 Mitsubishi G3M

Mitsubishi G3M

The Mitsubishi G3M was a Japanese bomber used during World War II.-Design and development:...

1 bombers and 25 Type 96 Mitsubishi A6M4 fighters under the command of the Second Air Fleet. On January 15, 1941, it was reassigned to the 22nd Kōkū Sentai and deployed to Hankou

Hankou

Hankou was one of the three cities whose merging formed modern-day Wuhan, the capital of the Hubei province, China. It stands north of the Han and Yangtze Rivers where the Han falls into the Yangtze...

 in central 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...

.

Operations in China

While based at Hankou, the bombers of the Genzan Air Group was primarily assigned to strategic bombing

Strategic bombing

Strategic bombing is a military strategy used in a total war with the goal of defeating an enemy nation-state by destroying its economic ability and public will to wage war rather than destroying its land or naval forces...

 missions in Sichuan Province, while the fighters were assigned to combat air patrol

Combat air patrol

Combat air patrol is a type of flying mission for fighter aircraft.A combat air patrol is an aircraft patrol provided over an objective area, over the force protected, over the critical area of a combat zone, or over an air defense area, for the purpose of intercepting and destroying hostile...

 and ground support missions in support of Imperial Japanese Army

Imperial Japanese Army

-Foundation:During the Meiji Restoration, the military forces loyal to the Emperor were samurai drawn primarily from the loyalist feudal domains of Satsuma and Chōshū...

 operations. The Genzan Air Group was withdrawn from China in September, 1941, returning to its home base at Genzan for training, and at the end of October, 1941 was forward deployed to Takao

Kaohsiung

Kaohsiung is a city located in southwestern Taiwan, facing the Taiwan Strait on the west. Kaohsiung, officially named Kaohsiung City, is divided into thirty-eight districts. The city is one of five special municipalities of the Republic of China...

 in Taiwan

Taiwan under Japanese rule

Between 1895 and 1945, Taiwan was a dependency of the Empire of Japan. The expansion into Taiwan was a part of Imperial Japan's general policy of southward expansion during the late 19th century....

.

Operations in Southeast Asia

With the bombing of Pearl Harbor and the outbreak of the Pacific War, the Genzan Air Group was deployed to Saigon, French Indochina

French Indochina

French Indochina was part of the French colonial empire in southeast Asia. A federation of the three Vietnamese regions, Tonkin , Annam , and Cochinchina , as well as Cambodia, was formed in 1887....

.
The group was a key participant in the sinking

Sinking of Prince of Wales and Repulse

The sinking of Prince of Wales and Repulse was a Second World War naval engagement that took place north of Singapore, off the east coast of Malaya, near Kuantan, Pahang where the British Royal Navy battleship HMS Prince of Wales and battlecruiser HMS Repulse were sunk by land-based bombers and...

 of the British capital ship

Capital ship

The capital ships of a navy are its most important warships; they generally possess the heaviest firepower and armor and are traditionally much larger than other naval vessels...

s and off the coast of Malaya

British Malaya

British Malaya loosely described a set of states on the Malay Peninsula and the Island of Singapore that were brought under British control between the 18th and the 20th centuries...

 on 10 December 1941, losing one aircraft and its crew during the battle.

On January 22, 1942, bombers from the Genzan Air Group attacked Kallang Airport

Kallang Airport

The Kallang Airport , also known as the Kallang Aerodrome, Kallang Airfield and RAF Kallang, opened in 1937 as Singapore's first purpose-built civil airport, together with an anchorage for seaplanes. Land was reclaimed in the Kallang Basin to turn the swampy area into a circular-shaped airfield and...

 in 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...

, and subsequently provided air support for Japanese offensives in Malaya

Battle of Malaya

The Malayan Campaign was a campaign fought by Allied and Japanese forces in Malaya, from 8 December 1941 – 31 January 1942 during the Second World War. The campaign was dominated by land battles between British Commonwealth army units, and the Imperial Japanese Army...

 including the landings at Endau

Battle off Endau

The Battle off Endau was a Second World War naval battle. It took place off Endau on 27 January 1942. Part of the Battle of Malaya, it was the first major naval engagement since the sinking of the battleship and the battlecruiser , and the last effort by the Royal Navy to intercept Japanese convoy...

.
At the end of February, the unit was transferred to Bangkok

Bangkok

Bangkok is the capital and largest urban area city in Thailand. It is known in Thai as Krung Thep Maha Nakhon or simply Krung Thep , meaning "city of angels." The full name of Bangkok is Krung Thep Mahanakhon Amon Rattanakosin Mahintharayutthaya Mahadilok Phop Noppharat Ratchathani Burirom...

 and assigned to patrols over 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...

; however, facilities at Bangkok were not satisfactory and the unit was soon reassigned to Palembang

Palembang

Palembang is the capital city of the South Sumatra province in Indonesia. Palembang is one of the oldest cities in Indonesia, and has a history of being a capital of a maritime empire. Located on the Musi River banks on the east coast of southern Sumatra island, it has an area of 400.61 square...

 in Sumatra

Sumatra

Sumatra is an island in western Indonesia, westernmost of the Sunda Islands. It is the largest island entirely in Indonesia , and the sixth largest island in the world at 473,481 km2 with a population of 50,365,538...

 in the Netherlands East Indies, with some aircraft dispersed to Kuching

Kuching

Kuching , officially the City of Kuching, and formerly the City of Sarawak, is the capital and most populous city of the East Malaysian state of Sarawak. It is the largest city on the island of Borneo, and the fourth largest city in Malaysia....

 in Sarawak

Kingdom of Sarawak

The Kingdom of Sarawak was a state in Borneo established by Sir James Brooke in 1842 by receiving independent kingdom status from the Sultanate of Brunei as a reward for helping fight piracy and insurgency...

.

On May 1 1942, Genzan's flying unit was redeployed 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...

 to support the Japanese campaign in New Guinea

New Guinea campaign

The New Guinea campaign was one of the major military campaigns of World War II.Before the war, the island of New Guinea was split between:...

. The group participated in the Battle of the Coral Sea

Battle of the Coral Sea

The Battle of the Coral Sea, fought from 4–8 May 1942, was a major naval battle in the Pacific Theater of World War II between the Imperial Japanese Navy and Allied naval and air forces from the United States and Australia. The battle was the first fleet action in which aircraft carriers engaged...

, without success, and made numerous bombing attacks against Port Moresby

Port Moresby

Port Moresby , or Pot Mosbi in Tok Pisin, is the capital and largest city of Papua New Guinea . It is located on the shores of the Gulf of Papua, on the southeastern coast of the island of New Guinea, which made it a prime objective for conquest by the Imperial Japanese forces during 1942–43...

.

In July, after the cancellation of Operation Mo

Operation Mo

Operation Mo or the Port Moresby Operation was the name of the 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 with the goal of isolating Australia and New Zealand from their ally the United States...

, the unit was withdrawn to Japan and was based at Misawa, Aomori

Misawa, Aomori

is a city located in eastern Aomori Prefecture in the Tōhoku region of Japan. As of 2009, the city had an estimated population of 42,399 and a density of 353 persons per km²...

 for training. Its fighter unit was detached and redesignated as the 252 Kōkūtai

252 Air Group

was a fighter aircraft unit of the Imperial Japanese Navy during the Pacific campaign of World War II. The unit's name is translated into English as the "252 Air Group" instead of "252nd Air Group" because each numeral in the unit's name was a discrete identifier of information pertaining to the...

 in September. The Genzan's flying unit was disbanded by being redesignated as the 755 Kōkūtai on 1 November 1942.