World War I & World War II Canadian PostersPDF File705 Canadian war posters, in English and French, created during the First World War and the Second World War.As a dominion of the British Empire, Canadian participation in World War I was nearly automatic, when Britain declared war on Germany and its allies. The size of Canada's expeditionary force reached 620,000. By the end of the war 67,000 had been killed and 173,000 wounded. On September 10, 1939, the Parliament of Canada declared war o