More than one million Australian men served in the war out of a total population of around seven million. Although it was ill-prepared for war, the Australian government soon dispatched squadrons and personnel to serve with the Royal Air Force. The Royal Australian Navy (RAN) commenced operations against Italy in June 1940. Later that year the Australian Army entered the North Africa campaign and fought in Greece. German submarines and raiding ships operated in Australian waters throughout the war. After the outbreak of hostilities with Japan in late 1941, Japanese aircraft launched a bombing attack on Darwin in February, and smaller Air raids on Australia, 1942–43.