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 bigpigeon.us webpage WWII Japan > Japan Lashes Out > Northern Melanesia, 1942, © 2026 by Robert A. Christiansen, updated by RAC 28 Dec 2025
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​In early 1942, Japanese forces landed on the northern coast of New Guinea, the Bismarck Archipelago, and the Solomon Islands. Only at Rabaul on the island of New Britain did they meet any resistance.
The South & SW Pacific webpages contain information about the 1942-44 Allied reconquest of this area.
Melanesia
The numerous island groups in the central Pacific are divided into three cultural areas, Polynesia, Micronesia, and Melanesia.

The island groups of Melanesia lie in the South Pacific between Indonesia and Australia to the west, Micronesia to the north, and Polynesia to the east.

Before WWII, northern Melanesia was divided politically into British, Australian and Dutch colonies.

Most of Micronesia, north of Melanesia, were Germany colonies before WWI and between the World Wars was administrated by Japan through the League of Nations. Japan put their infrastructure developments in Micronesia to good use during WWII. 
Melanesia in Context
Melanesia in Context
Northern Melanesia
Before WWII, northern Melanesia was divided into four jurisdictions:
  • Western New Guinea (capital Hollandia) was part of the Netherlands East Indies, todays Indonesia.
  • Southeastern New Guinea, known as Papua (capital Port Moresby), was a territory of the Dominion of Australia.
  • The Territory of New Guinea (capital Rabaul) included northeastern New Guinea, the Bismarck Archipelago, and the northern Solomon Island of Bougainville. It was administered by Australia under a mandate from the League of Nations, having been a German colony before WWI.
  • The British Solomon Islands (capital Tulagi) included all of the Solomon Islands chain except for the Bougainville area in the north. 
Northern Melanesia 1920-1940
Northern Melanesia 1920-1940
Also shown above are the New Hebrides, then jointly administered by Great Britain and France and now the island nation of Vanuatu.

Today's nation of Papua consists of former Southeastern New Guinea and the Territory of New Guinea.
The following more-detailed map shows a portion of northern Melanesia.
  • Cape York, on the bottom left, is part of the Australian continent.​
  • The three New Guinea capitals are Hollandia, the capital of the Dutch area, in the left center, Rabaul, on the island of New Britain in the center, and the Papuan capital Port Moresby in the bottom left.
World War II in Melanesia
  • Between January and July of 1942, Japanese forces occupied key locations in northern Melanesia.
  • From the beginning of the Solomon Islands campaign on Guadualcanal in August 1942, and until the Gilbert Islands campaign to the east in November 1943, most Allied combat in the Pacific was in the area shown on the accompanying map.
  • United States, Australian, and New Zealand forces painfully forced the Japanese from most occupied areas of Melanesia in brutal battles sometimes lasting for months. Over 40 Pottawattamie area men, Navy, Army, Air Force and Marine, died.
New Guinea & the Solomons
New Guinea (eastern part), the Solomon Islands and the Bismarck Archipelago.
Scalable version of map
The main Allied bases supporting early combat operations in Melanesia were:
  • Brisbane, on the east coast of Australia.
  • New Caledonia and the New Hebrides in southern Melanesia. (New Hebrides is now the nation of Vanuatu.)
  • Port Moresby on the southeastern coast of New Guinea.
When major combat ceased in Melanesia in the third quarter of 1944, Japanese pockets remained near Rabaul in New Britain, on Bougainville, and in the interior of New Guinea.
The 1942 Japanese Invasion of Northern Melanesia
Selected 1942 Japanese advances:
  • 23 January: Rabaul on northern New Britain Island in the Bismarck Archipelago. Japan then developed Rabaul, which has a magnificent harbor,  into its major base in the South/Southwest Pacific.
  • 7 March Salamaua and Lae on the Huon Gulf in the Territory of New Guinea.
  • 8 April: Admiralty Islands in the Bismarck Archipelago.
  • 3 May: Tulagi near Florida Island just north of Guadalcanal in the Solomon Islands.
  • 6 July: Guadalcanal in the central Solomon Islands.
  • ​21 July: Buna/Gona in Southeastern New Guinea. 
Japanese Advances in Melanesia - Early 1942
Japanese Advances in Melanesia, early 1942
Note that the January 1942 Japanese invasions of Melanesia were launched from:
  • The island of Guam, a United States colony in the Mariana Islands, seized by Japan shortly after the attack on Pearl Harbor.
  • The island of Truk, now known as Chuuk, in the Caroline Islands, developed by Japan as their major military base in the Central Pacific.
The Battle of Rabaul
​Click to see a current scalable photo of Rabaul
In the 1942 Battle of Rabaul, both Australian and Japanese deaths were remarkably small. However, over 1,000 Australian soldiers from the Rabaul defenders, known as Lark Force, were taken prisoner. Their tragic fate:
  • About 4 February, around 160 Lark Force members were bayoneted to death by the Japanese.
  • On 1 July, over 800 Lark Force prisoners died when the ship on which they were being transported from Rabaul to Japan, the Montevideo Maru, was sunk off the north coast of Luzon by the American submarine USS Sturgeon (SS-187).
Sources for Big Pigeon's Japan Lashes Out > Northern Melanesia, 1942 webpage:
🇺🇸 Pottawattamie Area WWII Dead — WWII Japan > Japan Lashes Out > Northern Melanesia, 1942 webpage​:
05-06 - WWII Japan > Japan Lashes Out > Northern Melanesia:
  • No US military personnel were involved in the 1942 Japanese conquest of northern Melanesia.