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The Battle of Ridgeway is also known as the Battle of Lime Ridge or Limestone Ridge. It was fought on the morning of 2 June 1866, near the village of Ridgeway and the town of Fort Erie in Canada West (present-day Ontario). Around 850 Canadian soldiers clashed with 750 to 800 Fenians — Irish American insurgents who had crossed the Niagara River from Buffalo, New York. It was the first industrial-era battle to be fought exclusively by Canadian troops and led entirely by Canadian officers. It was the last battle fought in Ontario against a foreign invasion force. The battlefield was designated a National Historic Site in 1921.

Between the 1950s and the 1990s, the Canadian government responded to national security concerns generated by Cold War tensions with the Soviet Union by spying on, exposing and removing suspected LGBTQ individuals from the federal public service and the Canadian Armed Forces. They were cast as social and political subversives and seen as targets for blackmail by communist regimes seeking classified information. These characterizations were justified by arguments that people who engaged in same-sex relations suffered from a “character weakness” and had something to hide because their sexuality was considered a taboo and, under certain circumstances, was illegal. As a result, the RCMP investigated large numbers of people. Many of them were fired, demoted or forced to resign — even if they had no access to security information. These measures were kept out of public view to prevent scandal and to keep counter-espionage operations under wraps. In 2017, the federal government issued an official apology for its discriminatory actions and policies, along with a $145-million compensation package.

In 1837 and 1838, insurgents in Upper and Lower Canada led rebellions against the Crown and the political status quo. The revolt in Lower Canada was more serious and violent than the rebellion in Upper Canada. However, both events inspired the pivotal Durham Report. It led to the Act of Union, which merged the two colonies into the Province of Canada. It also resulted in the introduction of responsible government. These were critical events on the road to Canadian nationhood.

The Dutch Hunger Winter was a severe food crisis that took place in the Netherlands in 1944–45, during the Second World War. By the time the country was liberated by Canadian and Allied forces in May 1945, around 20,000 Dutch people had died from the famine. With liberation came an influx of food and other provisions for the starving population. The Canadian role in liberating the Netherlands resulted in a lasting relationship between the two countries.

When Canada declared war on Germany on 10 September 1939, tens of thousands of Canadians enlisted to serve in the army, navy,  air force and supporting services. The military scrambled to buy equipment, train recruits and prepare for war. Little thought was given, at first, to documenting the war effort. By 1940, however, the military was recruiting historians, most notably Charles Stacey, to collect records and write accounts of Canadian operations. In the following years, artists, photographers and filmmakers also served with the various branches of the armed forces. Today, their diligent work provides a rich visual and written catalogue of Canada’s history in the Second World War.

The Canadian Forces Snowbirds are a military aerobatics team. They are officially known as "431 Air Demonstration Squadron." Since 1971, the team has performed across North America before millions of people. The Snowbirds have been recognized as among the best in the world at precision formation aerobatics and stunning solo crosses with minimum separation between the aircraft.

In international relations, the term middle power refers to a state that wields less influence on the world stage than a superpower. As the term suggests, middle powers fall in the middle of the scale measuring a country’s international influence. Where superpowers have great influence over other countries, middle powers have moderate influence over international events. Canada was considered to be a middle power during the postwar period — from 1945 until about 1960. Though Canada was not as powerful or prominent as the United Kingdom or the United States during this time, it was an international player that influenced events through moral leadership, peacekeeping and conflict mediation.

The SS Caribou was a passenger and train ferry that operated in the Cabot Strait between Port aux Basques, Newfoundland and North Sydney, Nova Scotia. On 14 October 1942, the German submarine U-69 sank the vessel, causing the worst loss of life in Canadian waters during the Second World War.

The Responsibility to Protect (R2P) is a non-binding political commitment made by United Nations Member States to protect populations from genocide, crimes against humanity, ethnic cleansing and war crimes. Canadian leadership was instrumental in the establishment of the International Commission on Intervention and State Sovereignty (ICISS) in 2000, which led to the development and eventual adoption of R2P at the 2005 UN World Summit (see also Canada and Peacekeeping).

Thousands of Indigenous peoples served in the Canadian military forces in the First World War and Second World War, mostly voluntarily. On the home front, most Indigenous communities participated in the national war effort in diverse ways.

​The Battle of Festubert was the second major engagement fought by Canadian troops in the First World War.

The Second World War was a defining event in Canadian history, transforming a quiet country on the fringes of global affairs into a critical player in the 20th century's most important struggle. Canada carried out a vital role in the Battle of the Atlantic and the air war over Germany, and contributed forces to the campaigns of western Europe beyond what might be expected of a small nation of then only 11 million people. Between 1939 and 1945 more than one million Canadian men and women served full-time in the armed services. More than 43,000 were killed. Despite the bloodshed, the war against Germany and the Axis powers reinvigorated Canada's industrial base, elevated the role of women in the economy, paved the way for Canada's membership in NATO, and left Canadians with a legacy of proud service and sacrifice embodied in names such as Dieppe, Hong Kong, Ortona and Juno Beach.

Military aviation began with the use of balloons for observation as early as 1794, during the French Revolution.

The Battle of Britain (10 July to 31 October 1940) was the first battle of the Second World War fought mainly in the air. After nearly four months of anxious combat, the Royal Air Force’s (RAF) Fighter Command stopped the German air force's attempt, in advance of a planned invasion, to dominate the skies over southern and eastern England. Hundreds of Canadian air and ground crew participated in the battle, most as members of the RAF.