South West Pacific theatre of World War II
Encyclopedia
The South West Pacific Theatre, technically the South West Pacific Area, between 1942 and 1945, was one of two designated area commands and war theatre
Theater (warfare)
In warfare, a theater, is defined as an area or place within which important military events occur or are progressing. The entirety of the air, land, and sea area that is or that may potentially become involved in war operations....

s enumerated by the Combined Chiefs of Staff
Combined Chiefs of Staff
The Combined Chiefs of Staff was the supreme military command for the western Allies during World War II. It was a body constituted from the British Chiefs of Staff Committee and the American Joint Chiefs of Staff....

 (CCoS) 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...

 in the Pacific region
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...

.

The South West Pacific theatre included the Philippines
Philippines
The Philippines , officially known as the Republic of the Philippines , is a country in Southeast Asia in the western Pacific Ocean. To its north across the Luzon Strait lies Taiwan. West across the South China Sea sits Vietnam...

, the Dutch East Indies
Dutch East Indies
The Dutch East Indies was a Dutch colony that became modern Indonesia following World War II. It was formed from the nationalised colonies of the Dutch East India Company, which came under the administration of the Netherlands government in 1800....

 (excluding 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...

), 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....

, Australia, the Australian Territory of New Guinea
Territory of New Guinea
The Territory of New Guinea was the Australia-controlled, League of Nations-mandated territory in the north eastern part of the island of New Guinea, and surrounding islands, between 1920 and 1949...

 (including the Bismarck Archipelago
Bismarck Archipelago
The Bismarck Archipelago is a group of islands off the northeastern coast of New Guinea in the western Pacific Ocean and is part of the Islands Region of Papua New Guinea.-History:...

), the western part of the Solomon Islands
Solomon Islands
Solomon Islands is a sovereign state in Oceania, east of Papua New Guinea, consisting of nearly one thousand islands. It covers a land mass of . The capital, Honiara, is located on the island of Guadalcanal...

 and some neighbouring territories. The theatre takes its name from the major title of the Allied command
Allies of World War II
The Allies of World War II were the countries that opposed the Axis powers during the Second World War . Former Axis states contributing to the Allied victory are not considered Allied states...

, which was known simply as the "South West Pacific Area", with the commanding officer: "Commander South West Pacific Area", the first being General Douglas MacArthur
Douglas MacArthur
General of the Army Douglas MacArthur was an American general and field marshal of the Philippine Army. He was a Chief of Staff of the United States Army during the 1930s and played a prominent role in the Pacific theater during World War II. He received the Medal of Honor for his service in the...

–appointed in March 1942.

On March 30, 1942, the Allied South West Pacific Area command (SWPA) was formed and U.S. General Douglas MacArthur
Douglas MacArthur
General of the Army Douglas MacArthur was an American general and field marshal of the Philippine Army. He was a Chief of Staff of the United States Army during the 1930s and played a prominent role in the Pacific theater during World War II. He received the Medal of Honor for his service in the...

 was appointed Supreme Allied Commander South West Pacific Area. The other theatre, known as the Pacific Ocean theater of World War II
Pacific Ocean theater of World War II
The Pacific Ocean theatre was one of four major naval theatres of war of World War II, which pitted the forces of Japan against those of the United States, the British Commonwealth, the Netherlands and France....

, was commanded by Admiral Chester Nimitz
Chester Nimitz
Fleet Admiral Chester William Nimitz, GCB, USN was a five-star admiral in the United States Navy. He held the dual command of Commander in Chief, United States Pacific Fleet , for U.S. naval forces and Commander in Chief, Pacific Ocean Areas , for U.S...

.

In the theatre, Imperial Japanese
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...

 forces fought primarily United States and Australian forces, with the heavy lifting predominantly from the Australians on the ground for the majority of the first two years, while the air forces were soon predominated by American forces and equipment. Logistics were mixed. Dutch
Netherlands
The Netherlands is a constituent country of the Kingdom of the Netherlands, located mainly in North-West Europe and with several islands in the Caribbean. Mainland Netherlands borders the North Sea to the north and west, Belgium to the south, and Germany to the east, and shares maritime borders...

, Filipino
Philippines
The Philippines , officially known as the Republic of the Philippines , is a country in Southeast Asia in the western Pacific Ocean. To its north across the Luzon Strait lies Taiwan. West across the South China Sea sits Vietnam...

, British, Mexican and other Allied forces which had retreated to Australia or New Guinea also served in the theatre.

Most Japanese forces in the theatre were part of the Southern Expeditionary Army Group
Southern Expeditionary Army Group
The was a army group of the Imperial Japanese Army during World War II. It was responsible for all military operations in South East Asian and South West Pacific campaigns of World War II....

, which was formed on November 6, 1941, under General Hisaichi Terauchi (also known as Count Terauchi), who was ordered to attack and occupy Allied
Allies of World War II
The Allies of World War II were the countries that opposed the Axis powers during the Second World War . Former Axis states contributing to the Allied victory are not considered Allied states...

 territories in Southeast Asia
Southeast Asia
Southeast Asia, South-East Asia, South East Asia or Southeastern Asia is a subregion of Asia, consisting of the countries that are geographically south of China, east of India, west of New Guinea and north of Australia. The region lies on the intersection of geological plates, with heavy seismic...

 and the South Pacific.

Major campaigns in the theatre

  • Battle of the Philippines (1941–42)
    • Battle of Bataan
      Battle of Bataan
      The Battle of Bataan represented the most intense phase of Imperial Japan's invasion of the Philippines during World War II. The capture of the Philippine Islands was crucial to Japan's effort to control the Southwest Pacific, seize the resource-rich Dutch East Indies, and protect its Southeast...

    • Battle of Corregidor
      Battle of Corregidor
      The Battle for Corregidor was the culmination of the Japanese campaign for the conquest of the Philippines. The fall of Bataan on 9 April 1942 ended all organized opposition by the U.S...

  • Dutch East Indies campaign
    Dutch East Indies campaign
    The Dutch East Indies campaign of 1941–1942 was the conquest of the Dutch East Indies by forces from the Empire of Japan in the early days of the Pacific Campaign of World War II. Forces from the Allies attempted unsuccessfully to defend the islands. Indonesia was targeted by the Japanese for its...

    , 1941–42
    • Battle of Badung Strait
      Battle of Badung Strait
      The Battle of Badung Strait was a naval battle of the Pacific campaign of World War II, fought on the night of 19/20 February 1942 in Badung Strait between the American-British-Dutch-Australian Command and the Imperial Japanese Navy...

       19–20 February 1942
    • Battle of the Java Sea
      Battle of the Java Sea
      The Battle of the Java Sea was a decisive naval battle of the Pacific campaign of World War II, that sealed the fate of the Netherlands East Indies....

       27 February 1942
    • Battle of Sunda Strait
      Battle of Sunda Strait
      The Battle of Sunda Strait was a naval battle which occurred during World War II. On the night of 28 February – 1 March 1942, the Australian light cruiser and the American heavy cruiser faced a major Imperial Japanese Navy task force. After a fierce battle of several hours duration, both Allied...

       28 February – 1 March 1942
    • Second Battle of the Java Sea
      Second Battle of the Java Sea
      The Second Battle of the Java Sea was the last naval action of the Netherlands East Indies campaign, of 1941–1942. It occurred on 1 March 1942, two days after the first Battle of the Java Sea...

       1 March 1942
  • Guadalcanal Campaign
    Guadalcanal campaign
    The Guadalcanal Campaign, also known as the Battle of Guadalcanal and codenamed Operation Watchtower by Allied forces, was a military campaign fought between August 7, 1942 and February 9, 1943 on and around the island of Guadalcanal in the Pacific theatre of World War II...

     1942–43
    • Battle of Savo Island
      Battle of Savo Island
      The Battle of Savo Island, also known as the First Battle of Savo Island and, in Japanese sources, as the , was a naval battle of the Pacific Campaign of World War II, between the Imperial Japanese Navy and Allied naval forces...

       9 August 1942
    • Battle of the Eastern Solomons
      Battle of the Eastern Solomons
      The naval Battle of the Eastern Solomons The naval Battle of the Eastern Solomons The naval Battle of the Eastern Solomons (also known as the Battle of the Stewart Islands and, in Japanese sources, as the , took place on 24–25 August 1942, and was the third carrier battle of the Pacific campaign...

       24–25 August 1942
    • Battle of Cape Esperance
      Battle of Cape Esperance
      The Battle of Cape Esperance, also known as the Second Battle of Savo Island and, in Japanese sources, as the , took place on 11–12 October 1942, and was a naval battle of the Pacific campaign of World War II between the Imperial Japanese Navy and United States Navy...

       11–12 October 1942
    • Battle of the Santa Cruz Islands
      Battle of the Santa Cruz Islands
      The Battle of the Santa Cruz Islands, 26 October 1942, sometimes referred to as the Battle of Santa Cruz or in Japanese sources as the , was the fourth carrier battle of the Pacific campaign of World War II and the fourth major naval engagement fought between the United States Navy and the Imperial...

       26 October 1942
    • Naval Battle of Guadalcanal
      Naval Battle of Guadalcanal
      The Naval Battle of Guadalcanal, sometimes referred to as the Third and Fourth Battles of Savo Island, the Battle of the Solomons, The Battle of Friday the 13th, or, in Japanese sources, as the , took place from 12–15 November 1942, and was the decisive engagement in a series of naval battles...

       12–15 November 1942
    • Battle of Tassafaronga
      Battle of Tassafaronga
      The Battle of Tassafaronga, sometimes referred to as the Fourth Battle of Savo Island or, in Japanese sources, as the , was a nighttime naval battle that took place November 30, 1942 between United States Navy and Imperial Japanese Navy warships during the Guadalcanal campaign...

       30 November 1942
  • Solomon Islands campaign
    Solomon Islands campaign
    The Solomon Islands campaign was a major campaign of the Pacific War of World War II. The campaign began with Japanese landings and occupation of several areas in the British Solomon Islands and Bougainville, in the Territory of New Guinea, during the first six months of 1942...

     1943–45
    • Battle of Kula Gulf
      Battle of Kula Gulf
      The naval Battle of Kula Gulf took place in the early hours of 6 July 1943 during World War II and was between United States and Japanese ships off the coast of Kolombangara in the Solomon Islands.-Background:...

       6 July 1943
    • Battle of Kolombangara
      Battle of Kolombangara
      The Battle of Kolombangara was a naval battle of the Pacific campaign of World War II, fought on the night of 12/13 July 1943, off Kolombangara in the Solomon Islands.-Background:...

       13 July 1943
    • Battle of Vella Gulf
      Battle of Vella Gulf
      The was a naval battle of the Pacific campaign of World War II fought on the night of 6-7 August 1943, in Vella Gulf between Vella Lavella Island and Kolombangara Island in the Solomon Islands of the Southwest Pacific....

       6–7 August 1943
    • Naval Battle of Vella Lavella
      Naval Battle of Vella Lavella
      The was a naval battle of the Pacific campaign of World War II fought on the night of 6 October 1943, near the island of Vella Lavella in the Solomon Islands.-Background:...

       6–7 October 1943
    • Battle of Empress Augusta Bay
      Battle of Empress Augusta Bay
      The Battle of Empress Augusta Bay, on 1–2 November 1943—also known as the Battle of Gazelle Bay, Operation Cherry Blossom, and in Japanese sources as the Sea Battle of Bougainville Bay Shore —was a naval battle fought near the island of Bougainville...

       2 November 1943
    • Battle of Cape St. George
      Battle of Cape St. George
      The Battle of Cape St. George was a naval battle of the Pacific campaign of World War II fought on 25 November 1943, between Cape St. George, New Ireland, and Buka Island . It was the last engagement of surface ships in the Solomon Islands campaign.-Background:Americans had landed troops on...

       25 November 1943
  • New Guinea campaign
    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:...

    , 1942–45
    • 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...

       4–8 May 1942
    • Kokoda Track campaign
      Kokoda Track campaign
      The Kokoda Track campaign or Kokoda Trail campaign was part of the Pacific War of World War II. The campaign consisted of a series of battles fought between July and November 1942 between Japanese and Allied—primarily Australian—forces in what was then the Australian territory of Papua...

       1942
    • Battle of Buna-Gona
      Battle of Buna-Gona
      The Battle of Buna–Gona was a battle in the New Guinea campaign, a major part of the Pacific campaign of World War II. On 16 November 1942, Australian and United States forces attacked the main Japanese beachheads in New Guinea, at Buna, Sanananda and Gona. Both forces were riddled by disease and...

       1942
    • Battle of the Bismarck Sea
      Battle of the Bismarck Sea
      The Battle of the Bismarck Sea took place in the South West Pacific Area during World War II. During the course of the battle, aircraft of the U.S. 5th Air Force and the Royal Australian Air Force attacked a Japanese convoy that was carrying troops to Lae, New Guinea...

       2 March 1943
    • Landing at Nassau Bay
      Landing at Nassau Bay
      The Landing at Nassau Bay was an amphibious landing at Nassau Bay in the New Guinea campaign of World War II between June 30 - July 6, 1943. United States forces sought to capture a beachhead for a supply point to shorten the supply line for the proposed attack on Salamaua as part of the...

       1943
    • Salamaua-Lae campaign
      Salamaua-Lae campaign
      The Salamaua–Lae campaign was a series of actions in the New Guinea campaign of World War II. Australian and United States forces sought to capture two major Japanese bases, one in the town of Lae, and another one at Salamaua. The campaign to take the Salamaua and Lae area began with the Australian...

       1943
    • Huon Peninsula campaign
      Huon Peninsula campaign
      The Huon Peninsula campaign was a series of battles in the New Guinea campaign of the Second World War. Australian forces assaulted Japanese bases on the Huon Peninsula....

       1943
    • New Britain campaign 26 December 1943
    • Admiralty Islands campaign
      Admiralty Islands campaign
      The Admiralty Islands campaign was a series of battles in the New Guinea campaign of World War II in which the United States Army's 1st Cavalry Division occupied the Japanese-held Admiralty Islands....

       29 February 1944
    • Aitape-Wewak campaign
      Aitape-Wewak campaign
      The Aitape–Wewak campaign was one of the final campaigns of the Pacific Theatre of World War II. Between November 1944 and the end of the war in August 1945, the Australian 6th Division, with air and naval support, fought the Imperial Japanese 18th Army in northern New Guinea...

       22 April 1944
    • Invasion of Hollandia
      Operations Reckless and Persecution
      Operation Reckless, known as the Landing at Hollandia and Operation Persecution known as the Aitape landing, were Allied amphibious landings which commenced the Western New Guinea campaign. Both operations commenced on 22 April 1944....

       22 April 1944
    • Battle of Biak
      Battle of Biak
      The Battle of Biak was part of the New Guinea campaign of World War II. It was fought between the United States Army and the Japanese Army from May 27 to June 22, 1944. It was the first major tactical use of an ambush by the Japanese during the war....

       27 May 1944
    • Battle of Noemfoor
      Battle of Noemfoor
      The Battle of Noemfoor was a battle of World War II that took place on the island of Noemfoor, in Dutch New Guinea, between 2 July and 31 August 1944. United States and Australian forces attacked to capture Japanese bases on the island.-Background:...

       2 July 1944
    • Battle of Morotai
      Battle of Morotai
      The Battle of Morotai, part of the Pacific War, began on September 15, 1944, and continued until the war ended in August 1945. The fighting began when United States and Australian forces landed on the south-west corner of Morotai, a small island in the Netherlands East Indies , which the Allies...

       15 September 1944
  • Battle of Timor 1942–43
  • Philippines campaign (1944–45)
    • Battle of Leyte Gulf
      Battle of Leyte Gulf
      The Battle of Leyte Gulf, also called the "Battles for Leyte Gulf", and formerly known as the "Second Battle of the Philippine Sea", is generally considered to be the largest naval battle of World War II and, by some criteria, possibly the largest naval battle in history.It was fought in waters...

       20 October 1944
  • Borneo campaign (1945)
    Borneo campaign (1945)
    The Borneo Campaign of 1945 was the last major Allied campaign in the South West Pacific Area, during World War II. In a series of amphibious assaults between 1 May and 21 July, the Australian I Corps, under General Leslie Morshead, attacked Japanese forces occupying the island. Allied naval and...

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