On 3 September 1939 Prime Minister Robert Gordon Menzies announced the beginning of Australia's involvement in the Second World War on every national and commercial radio station in Australia.
Almost a million Australians, both men and women, served in the Second World War. They fought in campaigns against Germany and Italy in Europe, the Mediterranean and North Africa, as well as against Japan in south-east Asia and other parts of the Pacific. The Australian mainland came under direct attack for the first time, as Japanese aircraft bombed towns in north-west Australia and Japanese midget submarines attacked Sydney harbour.
On 7 May 1945 the German High Command authorised the signing of an unconditional surrender on all fronts: the war in Europe was over. The surrender was to take effect at midnight on 8–9 May 1945. On 14 August 1945 Japan accepted of the Allied demand for unconditional surrender. For Australia it meant that the Second World War was finally over.
The Royal Australian Navy (RAN) participated in operations against Italy after its entry into the war in June 1940. A few Australians flew in the Battle of Britain in August and September, but the Australian army was not engaged in combat until 1941, when the 6th, 7th, and 9th Divisions joined Allied operations in the Mediterranean and North Africa.