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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.

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.

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.

The Fenians were a secret society of Irish patriots who had emigrated from Ireland to the United States. Some members of this movement tried to take Canadian territory by force, so they could exchange it with Britain for Irish independence. From 1866 to 1871, the Fenians launched several small, armed attacks. Each raid was put down by government forces. Dozens were killed and wounded on both sides. The raids revealed shortfalls in the leadership, structure and training of the Canadian militia, and led to improvements in these areas. The raids also took place at a time of growing concern over the threat posed by American military and economic might. This led to increased support for Confederation.

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.)

The Battle of Seven Oaks, or the Victory of the Frog Plain (la Victoire de la Grenouillère), took place 19 June 1816. The battle was a culmination of the Pemmican Wars and the escalating fur trade disputes between the Hudson’s Bay Company (HBC) and the North West Company (NWC). Pemmican was the food supply that the fur traders depended on to carry out operations. On the day of the battle, a party of about 60 Métis and First Nations men, led by Cuthbert Grant, was heading west of the Forks to deliver pemmican to the NWC canoe brigades on Lake Winnipeg. They were confronted at Seven Oaks by HBC Governor Robert Semple and 28 men (mostly HBC officers and employees). The gunfire and hand-to-hand combat that resulted left Semple and 20 of the HBC party dead. On the Métis side, 16-year-old Joseph Letendre died, and Joseph Trottier was wounded.

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.

Brown's division crossed the Niagara River into Upper Canada on 3 July 1814 and within hours took possession of Fort Erie.

By November 1813, the Americans were in control of the Detroit River frontier while the British had established small outposts at Port Talbot and the village of Delaware.

On 12 July, Hull crossed the Detroit River unopposed and occupied Sandwich (Windsor). On 20 July, the general issued a bombastic proclamation to the Canadian militia to throw off their British shackles and embrace American liberty. Reconnaissance revealed that Amherstburg was weakly defended.

During the WAR OF 1812, British troops led by Lieutenant General Sir George PREVOST conducted a raid on Sackets Harbor, NY, having learned that the American naval squadron was at the western end of Lake Ontario supporting an American army in the NIAGARA PENINSULA.

Battle of Lundy's Lane National Historic Site marks the 25 July 1814 Battle of Lundy's Lane, the fiercest and bloodiest land action during the War of 1812.

First Skirmish at Lacolle Mill, 1812 This brief skirmish at Lacolle Mill (now Lacolle, Que) during the War of 1812 marked the end of the American campaign to invade Lower Canada and take Montréal in the fall of 1812.

The Battle of Plattsburgh (also known as the Battle of Lake Champlain) was a joint land and naval invasion of upper New York State and the last major British operation of the War of 1812 (not including the battles after the Treaty of Ghent), and is largely remembered as a debacle.