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The War of the Austrian Succession (1740–48) included conflict in Europe, North America and India. The military operations in North America are known as King George's War (1744–48).

Airplanes became an important part of modern warfare during the First World War (1914–18). Aircraft technology developed rapidly and by war’s end, airplanes were involved in reconnaissance, artillery spotting, air-to-air combat, strafing ground targets, anti-submarine warfare, tactical and strategic bombing and home defence. More than 20,000 Canadians served in British flying services (Royal Flying Corps, Royal Naval Air Service and Royal Air Force) during the war. Approximately 1,400 were killed or died from wounds or accidents. Canada did not have an air force during the First World War; a single-plane Canadian Aviation Corps was established in 1914, but never saw service and soon disbanded. Later, on 5 August 1918, two Canadian Air Force squadrons were formed in Britain, but were disbanded the next year when the British cut off funding. The Royal Canadian Naval Air Service was formed in September 1918 but lasted only three months before the war ended. Canada would not have a permanent air force until 1924 (see Royal Canadian Air Force).

The red poppy is a symbol of Remembrance Day that was inspired by the poem “In Flanders Fields,” written by Lieutenant-Colonel John McCrae. Canada officially adopted the poppy as a symbol of remembrance in 1921. Red poppy pins are sold by the Royal Canadian Legion and worn by millions of Canadians in the weeks leading up to and on 11 November.

​On the evening of 15 April 1945, the Canadian minesweeper HMCS Esquimalt set out from Halifax on an anti-submarine patrol around the harbour approaches.

Poison gas was used throughout the First World War by almost all armies. Its widespread use was unique in the history of warfare. The various types of gas, delivered by canisters, projectors, or shell, killed, maimed, and wore down morale. By 1918, soldiers of all armies encountered gas frequently while serving at the Western Front. Canadian soldiers were among the first to face the death clouds, at the Second Battle of Ypres in April 1915. At least 11,572 Canadian soldiers were casualties of poison gas, yet many were denied pensions after the war. During the Second World War, chemical weapons were not used on the battlefield; however, the Suffield Experimental Station in Alberta developed and tested chemical and biological weapons beginning in 1941. From about the middle of the 20th century, Canadian officials worked on the global stage to ban chemical weapons, and in the 1990s, Canada signed the Chemical Weapons Convention (see Arms Control and Disarmament.)

The Vietnam War was a Cold War-era conflict between communist Northern Vietnamese forces and United States-backed Southern Vietnamese forces. Canada officially played the role of neutral peacemaker, but secretly backed the American effort in Vietnam.

The War Measures Act was a federal law adopted by Parliament on 22 August 1914, after the beginning of the First World War. It gave broad powers to the Canadian government to maintain security and order during “war, invasion or insurrection.” It was used, controversially, to suspend the civil liberties of people in Canada who were considered “enemy aliens” during both world wars. This led to mass arrests and detentions without charges or trials. The War Measures Act was also invoked in Quebec during the 1970 October Crisis. The Act was repealed and replaced by the more limited Emergencies Act in 1988.

The War of 1812 was fought between Britain and the United States between 1812 and 1814. The war ended in a stalemate but had many lasting effects in Canada. It guaranteed Canada’s independence from the United States. It also gave Canadians their first experience working together as a community and helped develop a sense of nationhood.

(This article is a plain-language summary of the War of 1812. If you are interested in reading about this topic in more depth, please see our full-length entry War of 1812.)

The First World War of 1914–1918 was the bloodiest conflict in Canadian history, taking the lives of nearly 61,000 Canadians. It erased romantic notions of war, introducing slaughter on a massive scale, and instilled a fear of foreign military involvement that would last until the Second World War. The great achievements of Canadian soldiers on battlefields such as Ypres, Vimy and Passchendaele, however, ignited a sense of national pride and a confidence that Canada could stand on its own, apart from the British Empire, on the world stage. The war also deepened the divide between French and English Canada and marked the beginning of widespread state intervention in society and the economy.

(This is the full-length entry about the First World War. For a plain-language summary, please see First World War (Plain-Language Summary).)

The Seven Years' War (1756–63) was the first global war, fought in Europe, India, America, and at sea. In North America, imperial rivals Britain and France struggled for supremacy. In the United States, the conflict is known as the French and Indian War. Early in the war, the French (aided by Canadian militia and Indigenous allies) defeated several British attacks and captured a number of British forts. In 1758, the tide turned when the British captured Louisbourg, followed by Quebec City in 1759 and Montreal in 1760. With the Treaty of Paris of 1763, France formally ceded Canada to the British. The Seven Years’ War therefore laid the bicultural foundations of modern Canada.

This is the full-length entry about the Seven Years’ War. For a plain-language summary, please see Seven Years’ War (Plain-Language Summary).

The Battle of Hudson Bay took place on 5 September 1697 during King William’s War, the North American theatre of the Nine Years’ War between England and France. Throughout the conflict, French forces tried to capture enemy forts in and around Hudson Bay. One of these was York Factory, a lucrative and important trading post the Hudson’s Bay Company (HBC) built in 1684. The French captured York Factory in 1694, only to have the English take it back a year later. Then, in 1697, a naval battle ensued in Hudson Bay between English and French forces. Captain Pierre Le Moyne d'Iberville succeeded in taking York Factory for the French. The fort was later transferred back to the British after the Treaty of Utrecht of 1713. (See also Fur Trade in Canada.)

The Conquest (La Conquête) is a term used to describe the acquisition of Canada by Great Britain during the Seven Years’ War. It also refers to the resulting conditions experienced by Canada’s 60,000 to 70,000 French-speaking inhabitants and numerous Indigenous groups. French forces at Quebec City surrendered to British forces on 18 September 1759, a few days after the crucial Battle of the Plains of Abraham. French resistance ended in 1760 with the capitulation of Montreal. In 1763, the Treaty of Paris surrendered New France to Britain. The Royal Proclamation of 1763 introduced assimilative policies that ultimately failed. They were replaced by the provisions of the Quebec Act of 1774. Although it helped spark the American Revolutionary War (1775–83), the Act also granted Canadians enviable conditions that resulted in generations of relative stability.

Conscription is the compulsory enlistment or “call up” of citizens for military service. It is sometimes known as “the draft.” The federal government enacted conscription in both the First World War and the Second World War. Both instances created sharp divisions between English Canadians, who tended to support the practice, and French Canadians, who generally did not. Canada does not currently have mandatory military service. The Canadian Armed Forces are voluntary services.

The term a dish with one spoon refers to a concept developed by the Indigenous peoples of the Great Lakes region and northeastern North America. It was used to describe how land can be shared to the mutual benefit of all its inhabitants. According to the Haudenosaunee (Iroquois), the concept originated many hundreds of years ago and contributed greatly to the creation of the “Great League of Peace” — the Iroquois Confederacy made up of the Seneca, Cayuga, Oneida, Onondaga, and Mohawk nations. The Anishinaabeg (the Ojibwe, Odawa, Potawatomi, Mississauga, Saulteaux and Algonquin nations) refer to “a dish with one spoon” or “our dish” as “Gdoo – naaganinaa.”

The Korean War began 25 June 1950, when North Korean armed forces invaded South Korea. The war’s combat phase lasted until an armistice was signed 27 July 1953. As part of a United Nations (UN) force consisting of 16 countries, 26,791 Canadian military personnel served in the Korean War, during both the combat phase and as peacekeepers afterward. The last Canadian soldiers left Korea in 1957. After the two world wars, Korea remains Canada’s third-bloodiest overseas conflict, taking the lives of 516 Canadians and wounding more than 1,000. In total, an estimated three million people died during the war. More than half were civilians. The two Koreas remain technically at war today.