High Quality Content by WIKIPEDIA articles! In Australia, the outbreak of World War I was greeted with considerable enthusiasm. Even before Britain declared war on Germany on 4 August 1914, the nation pledged its support for the Empire alongside other Commonwealth nations and almost immediately began preparations to send forces overseas to participate in the conflict. The first campaign that Australians were involved in was in German New Guinea after a hastily raised force known as the Australian Naval and Military Expeditionary Force was dispatched from Australia to seize German possessions in the Pacific in September 1914. At the same time another expeditionary force, initially consisting of 20,000 men and known as the First Australian Imperial Force (AIF), was raised for service overseas.