-
1903
11 June - Serbian King Alexander Obrenovic is assassinated by the Black Hand nationalist movement
22 October - First Australian Defence Act -
1909
31 March - Serbia accepts Austrian control over Bosnia and Herzegovina
13 December - Second Australian Defence Act -
1914
28 June - Archduke Franz Ferdinand is assassinated, triggering tensions between European powers
2-7 August - Germany invades Luxembourg and Belgium
5 August - Australia's declaration of support for Britain in the war
5 August - A cannon at Point Nepean fires the first shot of WW1
10 August - Austria Hungary invades Russia
15 August - Founding of the Australian Imperial Force
29 October - The War Precautions Act 1914
30 October - Allied campaign at Ypres in Belgium, begins -
1915
30 January - Germany makes first use of gas in warfare
25 April - Gallipoli landing
18 February - Germany launches its U-boat campaign in British waters
6 September - The Aborigines Amending Protection Act, 1915 -
1916
21 February - The start of the Battle of Verdun
1 July - The Battle of the Somme begins
15 October - Germany resumes unrestricted submarine warfare against allied shipping
28 October - The first referendum on conscription fails -
1917
6 April - The US declares war on Germany
29 August - Canada passes the War Service Act conscripting people into the armed forces
Ausgust-September - 100,000 workers join the Great Strike in NSW and VIC
October - Indigenous Australians were permitted into the armed forces
31 October - The Battle of Bersheeba
7 November - Revolution brings the Communists to power in Russia
8 November - SA Nomenclature Act changes German sounding names
20 December - Second conscription referendum fails -
1918
11 November - The Armistice brings an end to fighting