page_title: Military history of Australia during World War II
section_title: Mopping up in New Guinea and the Solomons
hierarchical_section_title: Military history of Australia during World War II / War in the Pacific / Mopping up in New Guinea and the Solomons
caption_attribution_description: English: Plate No. 110 Mop-Up Operations in Eastern New Guinea, New Britain, and Bougainville
context_page_description: Australia entered World War II on 3 September 1939, following the government's acceptance of the United Kingdom's declaration of war on Nazi Germany. Australia later entered into a state of war with other members of the Axis powers, including the Kingdom of Italy on 11 June 1940, and the Empire of Japan on 9 December 1941. By the end of the war, almost a million Australians had served in the armed forces, whose military units fought primarily in the European theatre, North African campaign, and the South West Pacific theatre. In addition, Australia came under direct attack for the first time in its post-colonial history. Its casualties from enemy action during the war were 27,073 killed and 23,477 wounded.
  Australian Army units were gradually withdrawn from the Mediterranean and Europe following the outbreak of war with Japan. However, Royal Australian Air Force and Royal Australian Navy units and personnel continued to take part in the war against Germany and Italy. From 1942 until early 1944, Australian forces played a key role in the Pacific War, making up the majority of Allied strength throughout much of the fighting in the South West Pacific theatre.
context_section_description: In late 1944, the Australian Government committed twelve Australian Army brigades to replace six US Army divisions which were conducting defensive roles in Bougainville, New Britain and the Aitape-Wewak area in New Guinea. While the US units had largely conducted a static defence of their positions, their Australian replacements mounted offensive operations designed to destroy the remaining Japanese forces in these areas. The value of these campaigns was controversial at the time and remains so to this day. The Australian Government authorised these operations for primarily political reasons. It was believed that keeping the Army involved in the war would give Australia greater influence in any post-war peace conferences and that liberating Australian territories would enhance Australia's influence in its region. Critics of these campaigns argue that they were unnecessary and wasteful of the lives of the Australian soldiers involved as the Japanese forces were already isolated and ineffective.
  The 5th Division replaced the US 40th Infantry Division on New Britain during October and November 1944 and continued the New Britain Campaign with the goals of protecting Allied bases and confining the large Japanese force on the island to the area around Rabaul. In late November the 5th Division established bases closer to the Japanese perimeter and began aggressive patrols supported by the Allied Intelligence Bureau. The division conducted amphibious landings at Open Bay and Wide Bay at the base of the Gazelle Peninsula in early 1945, and defeated the small Japanese garrisons in these areas. By April the Japanese had been confined to their fortified positions in the Gazelle Peninsula by the Australian force's aggressive patrolling. The 5th Division suffered 53 fatalities and 140 wounded during this campaign. After the war it was found that the Japanese force was 93,000 strong, which was much higher than the 38,000 which Allied intelligence had estimated remained on New Britain.
  The II Corps continued the Bougainville Campaign after it replaced the US Army's XIV Corps between October and December 1944. The corps consisted of the 3rd Division, 11th Brigade and Fiji Infantry Regiment on Bougainville and the 23rd Brigade which garrisoned neighbouring islands and was supported by RAAF, RNZAF and USMC air units. While the XIV Corps had maintained a defensive posture, the Australians conducted offensive operations aimed at destroying the Japanese force on Bougainville. As the Japanese were split into several enclaves the II Corps fought geographically separated campaigns in the north, centre and southern portions of the island. The main focus was against the Japanese base at Buin in the south, and the offensives in the north and centre of the island were largely suspended from May 1945. While Australian operations on Bougainville continued until the end of the war, large Japanese forces remained at Buin and in the north of the island.
  The 6th Division was assigned responsibility for completing the destruction of the Japanese Eighteenth Army, which was the last large Japanese force remaining in the Australian portion of New Guinea. The division was reinforced by CMF and armoured units and began arriving at Aitape in October 1944. The 6th Division was also supported by several RAAF squadrons and RAN warships. In late 1944, the Australians launched a two-pronged offensive to the east towards Wewak. The 17th Brigade advanced through the inland Torricelli Mountains while the remainder of the division moved along the coast. Although the Eighteenth Army had suffered heavy casualties from previous fighting and disease, it mounted a strong resistance and inflicted significant casualties. The 6th Division's advance was also hampered by supply difficulties and bad weather. The Australians secured the coastal area by early May, with Wewak being captured on 10 May, after a small force was landed to the east of the town. By the end of the war, the Eighteenth Army had been forced into what it had designated its 'last stand' area which was under attac
caption: Australian and Japanese Army forces in New Guinea and the Solomon Islands in late 1944
exif: {"Image Orientation": "Horizontal (normal)", "Image XResolution": "200", "Image YResolution": "200", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "GIMP 2.10.12", "Image DateTime": "2019:09:06 15:15:07", "Image ExifOffset": "148", "Thumbnail ImageWidth": "256", "Thumbnail ImageLength": "181", "Thumbnail BitsPerSample": "[8, 8, 8]", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail PhotometricInterpretation": "6", "Thumbnail SamplesPerPixel": "3", "Thumbnail JPEGInterchangeFormat": "298", "Thumbnail JPEGInterchangeFormatLength": "12345", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "2005", "EXIF ExifImageLength": "1418"}