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During the Second World War, on 19 August 1942, the Allies launched a major raid on the French coastal port of Dieppe. Operation Jubilee was the first Canadian Army engagement in the European theatre of the war, designed to test the Allies' ability to launch amphibious assaults against Adolf Hitler's "Fortress Europe." The raid was a disaster: More than 900 Canadian soldiers were killed, and thousands more were wounded and taken prisoner. Despite the bloodshed, the raid provided valuable lessons for subsequent Allied amphibious assaults on Africa, Italy and Normandy.

Boyd's troops were doggedly pursued by a significantly smaller British force led by Lieutenant Colonel Joseph Wanton Morrison. After constant pressure from Canadian Voltigeurs and Tyendinaga Mohawks under Morrison's command, Boyd finally turned his army to confront them.

The Battle of Queenston Heights was fought during the War of 1812 on 13 October 1812. One of the most famous battles of the war, the Battle of Queenston Heights was the struggle for a portion of the Niagara escarpment overlooking Queenston, where more than 1,000 American soldiers crossed into Upper Canada. Part of the American force reached the top, circled the British artillery position and forced the British from the Heights. General Isaac Brock, one of the most respected British military leaders of his day, was killed leading a counter-attack. Mohawk chiefs John Norton and John Brant and about 80 Haudenosaunee and Delaware warriors held back the Americans for hours — long enough for reinforcements to arrive so that the British could retain the crucial outpost.

​As the only combatant unit in the Canadian Expeditionary Force (CEF) whose official language was French, the 22nd (French Canadian) Infantry Battalion, commonly referred to as the “Van Doos” (from vingt-deux, meaning twenty-two in French), was subject to more scrutiny than most Canadian units in the First World War.

One of the worst war crimes in Canadian history occurred in June, 1944, during the Battle of Normandy, following the D-Day landings of the Second World War. As many as 156 Canadian soldiers, taken prisoner by German forces, were executed by their captors during various incidents in the Normandy countryside.

The Battle of Passchendaele, also known as the Third Battle of Ypres, was fought during the First World War from 31 July to 10 November 1917. The battle took place on the Ypres salient on the Western Front, in Belgium, where German and Allied armies had been deadlocked for three years. On 31 July, the British began a new offensive, attempting to break through German lines by capturing a ridge near the ruined village of Passchendaele. After British, Australian and New Zealand troops launched failed assaults, the Canadian Corps joined the battle on 26 October. The Canadians captured the ridge on 6 November, despite heavy rain and shelling that turned the battlefield into a quagmire. Nearly 16,000 Canadians were killed or wounded. The Battle of Passchendaele did nothing to help the Allied effort and became a symbol of the senseless slaughter of the First World War.

The Battle of the Atlantic, from 1939 to 1945, was the longest continuous battle of the Second World War. Canada played a key role in the Allied struggle for control of the North Atlantic, as German submarines worked furiously to cripple the convoys shipping crucial supplies to Europe. Victory was costly: more than 70,000 Allied seamen, merchant mariners and airmen lost their lives, including approximately 4,400 from Canada and Newfoundland. Many civilians also lost their lives, including 136 passengers of the ferry SS Caribou.

For 45 years, the Canadian government investigated unidentified flying objects (UFOs). Several of its departments and agencies collected sighting reports of UFOs in Canadian airspace from 1950 to 1995. These investigations started during the Cold War, spurred by fears of Soviet incursions. What began as a military question eventually became a scientific one. From the start, however, the government was reluctant to study this topic. It devoted few resources to it, believing UFOs to be natural phenomena or the products of “delusional” minds. By contrast, many Canadian citizens were eager for information about UFOs. Citizens started their own investigations and petitioned the government for action. In 1995, due to budget cuts, the government stopped collecting reports altogether. For their part, citizen enthusiasts have continued to investigate UFOs.

The First Canadian Army was a field army formed in 1942 during the Second World War. It became an international force in 1943, when Allied units were added to keep the army up to strength. The First Canadian Army was commanded by A.G.L. McNaughton and H.D.G. “Harry” Crerar.

The Battle of the Scheldt was fought in northern Belgium and southwestern Netherlands in 1944 during the Second World War. It was part of the Allied campaign to liberate northwestern Europe and defeat Nazi Germany. The First Canadian Army played a crucial role in clearing the Scheldt of German forces, opening crucial supply lines via the port of Antwerp. However, this victory came at a cost. The Allies suffered nearly 13,000 casualties during the battle, including more than 6,300 Canadians.

Canada’s longest Second World War army campaign was in Italy. Canadian forces served in the heat, snow and mud of the grinding, nearly two-year Allied battle across Sicily and up the Italian peninsula—prying the country from Germany's grip, at a cost of more than 26,000 Canadian casualties.

The war in Afghanistan (2001–14) was Canada’s longest war and its first significant combat engagement since the Korean War (1950–53). After the 2001 terror attacks on the United States, Canada joined an international coalition to destroy the al-Qaeda terrorist network and the Taliban regime that sheltered it in Afghanistan. (See 9/11 and Canada). Although the Taliban were removed from power and the al-Qaeda network was disrupted, Canada and its allies failed to destroy either group, or to secure and stabilize Afghanistan. More than 40,000 Canadian Armed Forces members served in the 12-year campaign. The war killed 165 Canadians — 158 soldiers and 7 civilians. Many Canadian veterans of the war in Afghanistan suffer from post-traumatic stress disorder.

The 1944 Battle of Normandy — from the D-Day landings on 6 June through to the encirclement of the German army at Falaise on 21 August — was one of the pivotal events of the Second World War and the scene of some of Canada's greatest feats of arms. Canadian sailors, soldiers and airmen played a critical role in the Allied invasion of Normandy, also called Operation Overlord, beginning the bloody campaign to liberate Western Europe from Nazi occupation. Nearly 150,000 Allied troops landed or parachuted into the invasion area on D-Day, including 14,000 Canadians at Juno Beach. The Royal Canadian Navy contributed 110 ships and 10,000 sailors and the RCAF contributed 15 fighter and fighter-bomber squadrons to the assault. Total Allied casualties on D-Day reached more than 10,000, including 1,074 Canadians, of whom 359 were killed. By the end of the Battle of Normandy, the Allies had suffered 209,000 casualties, including more than 18,700 Canadians. Over 5,000 Canadian soldiers died.

The Seven Years’ War (1756–63) was the first global war. In North America, Britain and France fought each other with the help of Indigenous allies. At the end of the war, France gave Canada (Quebec) and Ile Royale (Cape Breton) to Britain, among other territories. This is the reason that Canada has a British monarch but three founding peoples — French, British and Indigenous.

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

In 1991, Canada joined an international military coalition to confront Iraq following its invasion of Kuwait. Canada contributed warships and fighter aircraft to the successful campaign to liberate Kuwait. It was the first time Canada sent women to war in combat roles, and it was the first time in decades that Canadian air and naval forces supported each other in a war zone. More than 5,100 Canadian military personnel served in the war, with a peak of about 2,700 in the region at one time. No members of the Canadian armed forces died during the conflict.

During the Napoleonic Wars, the British government raised regiments known as "fencibles" for home service. These temporary units were used to protect British interests wherever the units were raised, in Great Britain or North America, and were not to be deployed for overseas duty on foreign soil.

The siege of Fort Erie was a British blockade of their own fort located at the entrance to the Niagara River opposite Buffalo, New York, which the Americans had captured on 3 July 1814.

The Battle of Baltimore, from 12 to 15 September 1814, was a British defeat against American forces in the War of 1812.