Last major Allied campaign in the South West Pacific Area during World War II
This article is about the 1945 Allied campaign in Borneo. For the 1941-42 Japanese conquest of the island, see Battle of Borneo (1941–1942), Battle of Tarakan (1942), and Battle of Balikpapan (1942).
Borneo campaign
Part of South West Pacific theatre of World War II
Australian troops advancing towards Brunei
Date
1 May – 30 August 1945
Location
British Borneo and Dutch Borneo
Result
Allied victory[1]
Belligerents
Allies: Australia United States United Kingdom
North Borneo
Netherlands
Dutch East Indies
Japan
Commanders and leaders
Douglas MacArthur[2] Leslie Morshead Thomas Kinkaid
Michiaki Kamada Masao Baba
Strength
c. 74,000
32,000
Casualties and losses
2,100 casualties[3]
4,700 casualties[4]
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t
e
Borneo campaign
Agas
Semut
Tarakan
North Borneo
Labuan
Beaufort
Balikpapan
Order of battle
v
t
e
Pacific War
Central Pacific
Pearl Harbor
Marshalls–Gilberts raids
K
Doolittle Raid
Midway
Gilberts and Marshalls
Marianas and Palau
Volcano and Ryukyu
Truk
Ocean Island
Indian Ocean (1941–1945)
Japanese merchant raids
Andaman Islands
Homfreyganj massacre
Christmas Island
1st Indian Ocean
Ceylon
Bay of Bengal
2nd Indian Ocean
Southeast Asia
Indochina (1940)
Franco-Thai War
Thailand
Malaya
Hong Kong
Singapore
Indochina (1945)
Malacca Strait
Jurist
Tiderace
Zipper
Strategic bombing (1944–45)
Burma and India
Burma (1941–42)
Burma (1942–43)
Burma and India (1944)
Burma (1944–45)
Southwest Pacific
Dutch East Indies (1941–42)
Philippines (1941–42)
RY
Solomon Islands
Coral Sea
Timor
Australia
New Guinea
New Britain
Philippines (1944–45)
Borneo (1945)
North America
Ellwood
Aleutian Islands
Estevan Point Lighthouse
Fort Stevens
Lookout Air Raids
Fire balloon bombs
Project Hula
PX
Japan
Air raids
Tokyo
Yokosuka
Kure
Hiroshima and Nagasaki
Mariana Islands
Volcano and Ryukyu Islands
Starvation
Naval bombardments
Sagami Bay
South Sakhalin
Kuril Islands
Shumshu
Downfall
Japanese surrender
Manchuria and Northern Korea
Kantokuen
Manchuria (1945)
Mutanchiang
Chongjin
Second Sino-Japanese War
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t
e
South West Pacific theatre of World War II
Philippines campaign (1941–1942)
Lingayen Gulf
Lamon Bay
1st Bataan
1st Corregidor
Dutch East Indies campaign
1st Borneo
1st Tarakan
1st Balikpapan
Manado
Ambon
Sumatra
Badung Strait
Timor
Java Sea
Java
2nd Borneo
2nd Tarakan
North Borneo
2nd Balikpapan
Solomon Islands campaign
Guadalcanal
New Georgia
Treasury Islands
Bougainville
New Guinea campaign
Coral Sea
Kokoda Track
Buna–Gona
Bismarck Sea
Nassau Bay Landing
Salamaua-Lae
Huon Peninsula
Admiralty Islands
Aitape-Wewak
Recklesss
Persecution
Biak
Noemfoor
Morotai
New Britain campaign
Operation Cartwheel
Arawe
Cape Gloucester
Neutralisation of Rabaul
Talasea
Jacquinot Bay
Wide Bay–Open Bay
Philippines campaign (1944–1945)
Leyte
Leyte Gulf
Luzon
2nd Corregidor
Visayas
Mindanao
Borneo campaign
Agas
Semut
Tarakan
North Borneo
Labuan
Beaufort
Balikpapan
The Borneo campaign or Second Battle of Borneo was the last major Allied campaign in the South West Pacific Area during World War II to liberate Japanese-held British Borneo and Dutch Borneo. Designated collectively as Operation Oboe, a series of amphibious assaults between 1 May and 21 July 1945 were conducted by the Australian I Corps, under Lieutenant-General Leslie Morshead, against Imperial Japanese forces who had been occupying the island since late 1941 – early 1942. The main Japanese formation on the island was the Thirty-Seventh Army under Lieutenant-General Masao Baba, while the naval garrison was commanded by Vice-Admiral Michiaki Kamada. The Australian ground forces were supported by US and other Allied air and naval forces, with the US providing the bulk of the shipping and logistic support necessary to conduct the operation. The campaign was initially planned to involve six stages, but eventually landings were undertaken at four locations: Tarakan, Labuan, North Borneo and Balikpapan. Guerilla operations were also carried out by Dayak tribesmen and small numbers of Allied personnel in the interior of the island. While major combat operations were concluded by mid-July, localised fighting continued throughout Borneo until the end of the war in August. Initially intended to secure vital airfields and port facilities to support future operations, preparatory bombardment resulted in heavy damage to the island's infrastructure, including its oil production facilities. As a result, the strategic benefits the Allies gained from the campaign were negligible.
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