In 1939, Nazi Germany in Western Europe began to invade Poland, and World War II began. Two days after Germany blitzed Poland, Britain and France declared war on Nazi Germany. At this time, Canada was no longer a vassal of Britain and had the right to decide whether to join the war. The Canadian government did not choose to declare war on Germany at the same time as Britain and France, but declared war on the German army six days later on September 10, 1939, which also proved this point well. Although Canada's military strength was not outstanding compared with other major countries participating in the war at that time, such as Britain, France, and the United States, Canada still made its own outstanding contributions in different battlefields and different fields around the world, and these contributions all demonstrated Canada's spirit of international cooperation and sense of responsibility for maintaining peace. Its record may not be as outstanding as that of its main allies, but as an independent country, Canada's participation in the war and its contributions encouraged other peace-loving countries to participate in World War II. The purpose of this exhibition is to let the audience better understand Canada's different contributions in the three different fields of sea, land and air in the military during World War II and in local battlefields in Europe, Asia and America through the deeds of Canada's participation in some of the World War II battles.