Military history of Canada during the Second World War

The military history of Canada during the Second World War begins with the German invasion of Poland on 1 September 1939. While the Canadian Armed Forces were eventually active in nearly every theatre of war, most combat was centred in Italy, Northwestern Europe, and the North Atlantic. Over the course of the war, more than 1.1 million Canadians served in the Canadian Army, Royal Canadian Navy, Royal Canadian Air Force, and in forces across the Commonwealth. More than 44,000 lost their lives and 54,000 were wounded. The financial cost was $21.8 billion between 1939 and 1950. By the end of the war Canada had the world's fourth largest air force, and fifth largest navy. The Canadian Merchant Navy completed over 25,000 voyages across the Atlantic, 130,000 Allied pilots were trained in Canada in the British Commonwealth Air Training Plan. On D-Day, 6 June 1944 the 3rd Canadian Infantry Division landed on "Juno" beach in Normandy, in conjunction with allied forces. The Second World War had significant cultural, political and economic effects on Canada, including the conscription crisis in 1944 which affected unity between francophones and anglophones. The war effort strengthened the Canadian economy and furthered Canada's global position.

At the outbreak of the First World War, Canada was a quasi-independent Dominion of the British Empire and automatically went to war alongside the United Kingdom, albeit with full autonomy to decide the form and extent of its involvement. However, the 1931 Statute of Westminster transformed Canada into a fully sovereign state, theoretically co-equal with Britain and the other Dominions of the British Commonwealth. Despite this, some commentators at the time suggested that Canada was still bound by Britain's declaration of war because it had been made in the name of their common monarch, but the Canadian prime minister William Lyon Mackenzie King repeatedly declared that "Parliament will decide".

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