Key Dates in Australian Military History: A Timeline

If you're researching an ancestor's military service, one of the most useful things you can have is a working knowledge of when things happened. A date on a service record only means something when you know what was happening in the war at that point. A transfer to a new unit in July 1916 carries very different weight depending on whether you know that the Battle of Fromelles happened on 19 July that year.

This timeline covers the key dates in Australian military history from the Boer War through to Afghanistan. It's not exhaustive - entire books have been written about each of these conflicts - but it covers the dates that are most likely to appear on service records held by the National Archives of Australia and most relevant to family history research. For a deeper look at how to match dates on a service record to real events, see the guide on connecting your ancestor's record to real battles and campaigns.

The Boer War (1899-1902)

Australia's first overseas military deployment as a group of colonies - and then, from 1 January 1901, as a newly federated nation. Around 16,000 Australians served in South Africa, with approximately 600 killed. The Boer War is significant because it was the first time Australian troops served together under a unified command structure and the experience directly shaped the thinking behind the formation of the Australian military after Federation.

The first contingents of colonial troops departed for South Africa in late October and November 1899. The war ended on 31 May 1902 with the Treaty of Vereeniging. Service records for Boer War veterans are held by the NAA and some state archives, though coverage is less consistent than for later conflicts. The Australian War Memorial holds nominal rolls and other operational records from this period.

The First World War (1914-1918)

More than 330,000 Australians served overseas in WWI as part of the Australian Imperial Force (AIF). Over 60,000 were killed and 156,000 were wounded, gassed, or taken prisoner. WWI service records are the most commonly researched Australian military records and the most likely to be found in family collections.

1914

On 4 August 1914, Britain declared war on Germany and Australia, as a dominion of the British Empire, was automatically at war. Recruitment for the AIF began immediately. The first convoy of Australian troops departed Albany, Western Australia, on 1 November 1914, bound for Egypt. On 9 November 1914, HMAS Sydney destroyed the German cruiser SMS Emden near the Cocos Islands - the first major naval engagement involving the Royal Australian Navy.

1915

The landing at Gallipoli on 25 April 1915 is the most significant date in Australian military history and the origin of the day of national commemoration. Australian and New Zealand troops landed at what became known as Anzac Cove on the Gallipoli peninsula as part of a campaign to capture the Dardanelles strait and force the Ottoman Empire out of the war. The campaign lasted until the evacuation of Allied troops on 19-20 December 1915. Australia suffered over 26,000 casualties at Gallipoli, including 8,141 killed. Key actions during the campaign include the Battle of Lone Pine (6-10 August) and the assault on The Nek (7 August).

1916

After the evacuation from Gallipoli, the AIF was reorganised in Egypt and the infantry divisions moved to the Western Front in France from March 1916. The Battle of Fromelles on 19-20 July 1916 was the first major action fought by Australian troops on the Western Front and one of the most devastating - the 5th Division suffered 5,533 casualties in 24 hours. The Battle of Pozières (23 July - 3 September 1916) followed almost immediately, costing the 1st, 2nd, and 4th Divisions another 23,000 casualties over six weeks.

1917

The battles of Bullecourt (April and May 1917), Messines (7 June 1917), and Passchendaele (October-November 1917) were among the major Australian engagements on the Western Front during 1917. In the Middle East, the Australian Light Horse played a decisive role in the Palestine campaign, including the famous charge at Beersheba on 31 October 1917.

1918

The German Spring Offensive (March-April 1918) threatened to break the Allied lines. Australian divisions played a significant role in stopping the German advance, particularly at Villers-Bretonneux on 24-25 April 1918 - fought on the third anniversary of the Gallipoli landing. The Battle of Hamel on 4 July 1918, planned and led by Lieutenant General Sir John Monash, is regarded as one of the most successful set-piece operations of the war. The Australian Corps then participated in the Allied Hundred Days Offensive from August 1918, including the Battle of Amiens (8 August 1918) - described by German General Erich Ludendorff as "the black day of the German Army." The Armistice was signed on 11 November 1918.

The Second World War (1939-1945)

Almost one million Australians served in WWII, including both men and women. Over 39,000 were killed and more than 30,000 were taken prisoner, predominantly by the Japanese. WWII service records are held by the NAA, and while the format differs from WWI records, they contain similar categories of information. See the WWII ancestor research guide for details on accessing and interpreting these records.

1939-1940

Australia entered the war on 3 September 1939 when Prime Minister Robert Menzies announced that Britain had declared war on Germany. The 2nd AIF was raised for overseas service. The 6th Division deployed to North Africa in early 1940 and fought in the campaigns in Libya, Greece, and Crete. RAAF squadrons were already operating in Britain and the Middle East.

1941

The Siege of Tobruk (April-December 1941) saw the 9th Division defend the Libyan port against Rommel's forces for eight months - the troops earning the nickname "Rats of Tobruk" from a German propaganda broadcast. Japan entered the war on 7 December 1941 with the attack on Pearl Harbor, dramatically shifting the strategic focus to the Pacific.

1942

Singapore fell on 15 February 1942, and around 15,000 Australian troops were taken prisoner. On 19 February 1942, Darwin was bombed by Japanese aircraft - the first foreign attack on Australian soil. Japanese midget submarines entered Sydney Harbour on 31 May 1942. The Kokoda Track campaign (July-November 1942) in Papua New Guinea saw Australian militia and AIF troops halt the Japanese advance towards Port Moresby in some of the most gruelling conditions of the entire war. The Battle of El Alamein (23 October - 11 November 1942) in North Africa was the 9th Division's last major action in that theatre.

1943-1945

Australian forces were involved in operations across the South-West Pacific throughout 1943-1945, including campaigns in New Guinea, Borneo, and the Solomon Islands. The last major Australian operations of the war were the Borneo campaign landings at Tarakan (1 May 1945), Brunei Bay (10 June 1945), and Balikpapan (1 July 1945). Japan surrendered on 15 August 1945 (VP Day). The formal surrender was signed on 2 September 1945. Australian forces then participated in the British Commonwealth Occupation Force (BCOF) in Japan from February 1946.

Korea (1950-1953)

Around 17,000 Australians served in the Korean War. Australia committed ground forces (primarily the 3rd Battalion, Royal Australian Regiment - 3RAR), RAAF fighter and transport squadrons, and naval vessels. The Battle of Kapyong on 23-24 April 1951 was one of the most significant Australian engagements of the war, with 3RAR helping to halt a major Chinese offensive. A total of 340 Australians were killed in Korea. The armistice was signed on 27 July 1953.

Malayan Emergency (1950-1960)

Australian forces deployed to Malaya from 1950 to support British and Malayan forces against a communist insurgency. Service was primarily by Australian Army infantry battalions and RAAF squadrons. The emergency was declared over on 31 July 1960. Thirty-nine Australians were killed during this period.

Indonesian Confrontation (1962-1966)

A small, undeclared conflict in which Australian forces supported Malaysia against Indonesian incursions, primarily along the border in Borneo. Twenty-three Australians were killed. This conflict is less well known but service records for those who served do exist and can be requested from the NAA.

Vietnam (1962-1973)

Australia's initial commitment of 30 military advisers (the Australian Army Training Team Vietnam, or AATTV) in August 1962 grew to a peak of over 7,600 personnel following the commitment of the 1st Battalion, Royal Australian Regiment (1RAR) in June 1965. The Battle of Long Tan on 18 August 1966 is the most well-known Australian action of the Vietnam War, when D Company, 6RAR held off a much larger North Vietnamese and Viet Cong force in a rubber plantation near the Australian base at Nui Dat. Approximately 60,000 Australians served in Vietnam. A total of 521 were killed and over 3,000 wounded. The last Australian combat troops withdrew in 1972, though a small presence remained until 1973.

Post-Vietnam operations

Australian Defence Force personnel have served in numerous operations since Vietnam, including the First Gulf War (1990-1991), peacekeeping operations in Rwanda, Somalia, Cambodia, and the Solomon Islands, the International Force for East Timor (INTERFET) from September 1999, and operations in Afghanistan (2001-2021) and Iraq (2003-2009, with subsequent training missions). Service records for post-Vietnam operations are held by the Department of Defence and may be subject to access restrictions due to privacy considerations for living personnel.

Why these dates matter for service records

Every date on a service record corresponds to something that was happening in the war. A transfer, a hospitalisation, a promotion, a disciplinary entry - each one sits within the broader timeline of events. Knowing the key dates helps you understand not just what happened to your ancestor, but why.

If your ancestor's record shows he was taken on strength to the 9th Division in early 1941, this timeline tells you he was heading for Tobruk. If her RAAF record shows a posting to the Pacific in mid-1943, she was part of the air campaign in New Guinea. The dates are the skeleton. The contextual research fills in the rest.

A Decode My Digger decode does this mapping automatically - taking every dated entry on a service record and placing it against the timeline of the war, the movements of the unit, and the conditions on the ground at that time and place.

Frequently asked questions

Does the National Archives hold records for all these conflicts?

Yes. The NAA holds service records for personnel who served from the Boer War through to the Vietnam War. The format, series numbers, and level of digitisation vary between conflicts. WWI records are the most comprehensively digitised. Post-WWII records may require a formal request through the NAA or the Department of Defence.

Which conflict has the most detailed service records?

WWI service records tend to be the most individually detailed because they were compiled by hand over the course of the war, with entries added as events occurred. They often include handwritten proceedings sheets, medical records, correspondence, and attestation papers with physical descriptions. WWII records are more standardised and often typed, which makes them easier to read but sometimes less granular. The WWI research guide covers the full range of documents you'll find in a WWI record file.

Are there commemorative days for each conflict?

25 April is the primary national day of commemoration, observed since 1916. Remembrance Day on 11 November marks the anniversary of the WWI Armistice and honours all Australians who have served and died in war. VP Day (15 August) marks the end of WWII in the Pacific. Other dates are observed within specific service communities - for example, 18 August (the anniversary of Long Tan) is Vietnam Veterans' Day.

How do I find out which unit my ancestor served in?

The unit is recorded on the service record itself, typically on the proceedings or history sheet. If you haven't accessed the record yet, the guide to requesting war records from the NAA walks through the process step by step. If you have the record but can't read it, the handwriting guide and abbreviations guide can help.

Can Decode My Digger decode records from any of these conflicts?

Yes. Decode My Digger covers all three services - Army, Navy, and RAAF - across all conflicts from the Boer War through to the Vietnam War. The decode service produces a line-by-line Excel spreadsheet and a contextualised Word narrative regardless of which conflict the record relates to.