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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).

The CIM-10B Bomarc was the world’s first long-range, nuclear capable, ground-to-air anti-aircraft missile. Two squadrons of the missile were purchased and deployed by the Canadian government in 1958. This was part of Canada’s role during the Cold War to defend North America against an attack from the Soviet Union. Prime Minister John Diefenbaker’s refusal to equip the missiles with nuclear warheads led to a souring of Canada’s relationship with the United States, especially once the Cuban Missile Crisis brought the issue to the fore. The issue split Diefenbaker’s Cabinet and contributed to his party losing the 1963 election.

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).

In December 1943, as part of the Allied advance through Italy during the Second World War, Canadian forces fought one of their toughest battles of the war in a bid to capture the town of Ortona. The month-long campaign — first at the Moro River outside Ortona, then with vicious street fighting in the town itself — cost more than 2,300 Canadian casualties, but eventually won Ortona for the Allies.

In 1939, Canada, Great Britain, New Zealand and Australia signed an agreement creating the British Commonwealth Air Training Plan (BCATP). Located in Canada, the plan's mandate was to train Allied aircrews for the Second World War, including pilots, navigators, bomb aimers, wireless operators, air gunners, and flight engineers. More than 130,000 crewmen and women were trained between 1939 and 1945, making this one of Canada's great contributions to Allied victory in the war. It led United States President Franklin Roosevelt to call Canada the "aerodrome of democracy."

The Royal Canadian Naval Air Service (RCNAS) was formed during the closing months of the First World War to help counter the German U-boat threat on Canada’s East Coast. It was disbanded after only three months of existence. A Canadian naval air service was not created again until after the Second World War.

The Canadian Aviation Corps was formed in September 1914, immediately after the start of the First World War. The three-person, one-plane unit sailed to Britain with the First Canadian Contingent in early October 1914 but never saw active service. The CAC was disbanded in May 1915. Canada would not have a permanent air force until 1924 (see Royal Canadian Air Force).

During the First World War, more than 5,000 Canadian pilots served in the Royal Flying Corps (RFC). The RFC was formed on 13 April 1912 to satisfy Britain's need for a military presence in the expanding field of aviation. It joined with the Royal Naval Air Service (RNAS) in April 1918 to become the Royal Air Force. During the war, an RFC/RAF training program in Canada produced approximately 10,500 pilots, mechanics and aircraftmen.

The armed forces are the land, naval and air forces commanded by the federal government for the purpose of defending Canada's security, protecting its citizens, and promoting its strategic interests at home or abroad. The armed forces have evolved since colonial times from small, local militia units to the modern professional military forces of today.

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.

In 1775 at the start of the American Revolution, rebel forces invaded Canada, occupying Montreal and attacking the town of Quebec.

When the First World War began in August 1914, the Royal Canadian Navy (RCN) was unprepared to fight a war at sea. Founded only in 1910, it consisted of two obsolete cruisers, HMCS Niobe and HMCS Rainbow, and about 350 regular sailors, augmented by 250 reservists. During the war, it was assigned a growing number of tasks, which it was ill-equipped to perform. This included protecting Canadian coastal waters against German U-boats. The RCN scrambled to find ships and sailors but was ill-equipped to fight enemy submarines, which sank several vessels in Canadian waters in 1918.

The Bloody Assize of Ancaster was a series of trials conducted after the War of 1812, in 1814, in which 19 men accused of supporting the American cause were officially charged with High Treason. The Ontario Archaeological and Historic Sites Board erected a memorial plaque in Ancaster to commemorate the trials.

During the Cold War, the Canadian Navy played a crucial role in antisubmarine warfare (ASW), working closely with its allies to patrol and monitor the North Atlantic and Pacific Oceans for Soviet submarine activity. Canada invested in new technology and continually modernized its fleet of ships and aircraft to better detect and counter Soviet submarines. It also operated strategic warning systems with its allies, particularly the United States. By the end of the Cold War, Canada had developed a very high reputation in the field.

The Seven Years' War (1756–63) was the first global war, fought in Europe, India, and 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).

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.)

On 28 April 1760, during the Seven Years’ War, the confrontation known as the battle of Sainte-Foy took place on the heights of Quebec City between the French and British armies. Seven thousand men under the command of French general François-Gaston de Lévis met 3,400 soldiers under the command of General James Murray in violent combat which ended with a major victory for the French. Following the battle, the French laid an unsuccessful siege to Quebec City and were eventually forced to retreat due to the arrival of British reinforcements on the St. Lawrence River.

During the Cold War, Canada stationed army and air force units abroad for the first time during peacetime. Soldiers and airmen began to arrive in the early 1950s, shortly after the Cold War began, and remained until 1993, after it ended. In total, more than 100,000 Canadian military personnel served in France and West Germany in that period.