Australia in World War II (1939–1945)
World War II was the most extensive and destructive conflict in human history, and for Australia it was a struggle fought on two fronts: first in support of Britain and the Allied cause in Europe and the Middle East, and later in defence of Australia itself as the war swept into the Pacific. More than one million Australians served during the war, and their contribution helped shape the nation’s identity, alliances, and place in the world.
Australia entered the war on 3 September 1939, following Britain’s declaration against Germany. The early years of the conflict saw Australian forces deployed far from home. The Royal Australian Navy was immediately active in convoy escort duties across the Indian Ocean and the Mediterranean. In 1941, HMAS Sydney was lost with all 645 hands after a battle with the German raider Kormoran — one of the most tragic events in Australian naval history.
The Australian Army’s first major operations occurred in the Middle East and North Africa. The 6th, 7th, and 9th Divisions fought in campaigns across Libya, Egypt, Syria, and Lebanon. At Tobruk in 1941, Australian soldiers became known as the “Rats of Tobruk,” holding the besieged port against repeated German and Italian assaults. Their stubborn defence became a symbol of Australian resilience and determination. Later, the 9th Division played a decisive role at El Alamein, contributing to the turning of the tide against the Axis forces in North Africa.
Australian airmen also served with distinction. Many flew with the Royal Air Force under the Empire Air Training Scheme, participating in bomber, fighter, and coastal operations across Europe. Their service came at a heavy cost, with thousands killed in the skies over Germany and occupied Europe. The Royal Australian Air Force expanded dramatically during the war, operating in multiple theatres and earning a reputation for skill and professionalism.
Everything changed in December 1941 when Japan entered the war. The fall of Singapore in February 1942 shocked Australia. More than 15,000 Australian troops were taken prisoner, many of whom would suffer and die in brutal captivity. With Japan advancing rapidly through Southeast Asia and the Pacific, Australia faced the real threat of invasion. The bombing of Darwin on 19 February 1942 — the largest attack ever mounted on Australian soil — brought the war directly to the nation’s doorstep.
Prime Minister John Curtin made a historic strategic shift, declaring that Australia would look to the United States for security. This decision laid the foundation for the modern Australia–US alliance. American forces arrived in large numbers, and together with Australian troops they fought to halt Japanese expansion.
The turning point came in Papua and New Guinea. In 1942, Australian soldiers fought a desperate campaign along the Kokoda Track, resisting Japanese attempts to capture Port Moresby. The terrain was unforgiving — steep mountains, dense jungle, and relentless rain — yet the Australians held firm. The battles at Kokoda, Milne Bay, Buna, and Gona were critical in stopping the Japanese advance and remain central to Australia’s wartime memory.
Australian forces continued to fight across the Pacific in campaigns in New Britain, Bougainville, and Borneo. These operations were gruelling, often overshadowed by larger American offensives, but they were vital in containing Japanese forces and liberating occupied territories. The RAAF played a major role in air support, reconnaissance, and maritime patrols, while the RAN operated across the Pacific and Indian Oceans, escorting convoys and supporting amphibious operations.
The war ended in 1945 with victory in Europe in May and victory over Japan in August. Australia emerged proud but deeply scarred. Almost 40,000 Australians were killed, and many more were wounded or traumatised. The war transformed Australian society, accelerated industrial development, and reshaped the nation’s strategic outlook. It also strengthened the bonds of service and sacrifice that underpin the mission of the Returned and Services League.
World War II remains one of the most significant chapters in Australia’s history. It was a time when Australians fought for freedom, defended their homeland, and forged alliances that endure to this day. The legacy of their service lives on in the values of courage, mateship, and resilience that continue to define the Australian spirit.
References
AWM, Second World War 1939–45.
DVA, Australia’s Involvement in WWII.
Long, G., Australia in the War of 1939–1945.
Stanley, P., Invading Australia.
Curtin, J., Parliamentary War Address.