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The Second Battle of Ypres was fought during the First World War from 22 April to 25 May 1915. It was the first major battle fought by Canadian troops in the Great War. The battle took place on the Ypres salient on the Western Front, in Belgium, outside the city of Ypres (now known by its Flemish name, Ieper). The untested Canadians distinguished themselves as a determined fighting force, resisting the horror of the first large-scale poison gas attack in modern history. Canadian troops held a strategically critical section of the frontline until reinforcements could be brought in. More than 6,500 Canadians were killed, wounded or captured in the Second Battle of Ypres.

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.

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.

The Naval Service Act, passed by the Liberal government of Sir Wilfrid Laurier, established the Royal Canadian Navy on 4 May 1910. Before the Act passed, Canada did not have a navy of its own and relied on the British Royal Navy. This new defence initiative was a direct response to the naval arms race between Britain and Germany in the years before the First World War and the 1909 panic in Britain over expansion of the German navy. The Act was built on earlier, distinctively Canadian approaches to defence and its key provisions remained in force until 1950. The Naval Service Act was bitterly opposed by French Canadian nationalists, led by Henri Bourassa, who feared deeper involvement in imperial affairs.

A merchant navy (or merchant marine) is a fleet of commercial vessels that carries troops and supplies in wartime. The history of Canada’s merchant fleet is one of up and downs. From the heady days of the late 19th century to its virtual disappearance a few years later, through a rapid build-up as a key Allied component during the Second World War, to its final demise in mid-20th century, Canada’s Merchant Navy has not been treated well.

The 1837 rebellion in Upper Canada was a less violent, more limited affair than the uprising earlier that year in Lower Canada. However, its leaders, including William Lyon Mackenzie, were equally serious in their demands. They wanted democratic reform and an end to the rule of a privileged oligarchy. The rebellion itself failed, but its very failure helped pave the way for moderate and careful political change in British North America. This included the union of Upper and Lower Canada into the Province of Canada and the eventual introduction of responsible government.

The Cold War refers to the period between the end of the Second World War and the collapse of the Soviet Union in 1991. During this time, the world was largely divided into two ideological camps — the United States-led capitalist “West” and the Soviet-dominated communist “East.” Canada aligned with the West. Its government structure, politics, society and popular perspectives matched those in the US, Britain, and other democratic countries. The global US-Soviet struggle took many different forms and touched many areas. It never became “hot” through direct military confrontation between the two main antagonists.

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).

Post-traumatic stress disorder (PTSD) is a mental illness that affects individuals exposed to trauma (although not all people exposed to trauma develop PTSD). Studies suggest that over 70 per cent of Canadians have been exposed to at least one traumatic event in their lifetime, and that nearly 1 out of 10 Canadians may develop PTSD at some point in their lives. PTSD can affect adults and children and can appear months or even years after exposure to the trauma.

The Battle of Vimy Ridge was fought during the First World War from 9 to 12 April 1917. It is Canada’s most celebrated military victory — an often mythologized symbol of the birth of Canadian national pride and awareness. The battle took place on the Western Front, in northern France. The four divisions of the Canadian Corps, fighting together for the first time, attacked the ridge from 9 to 12 April 1917 and captured it from the German army. It was the largest territorial advance of any Allied force to that point in the war — but it would mean little to the outcome of the conflict. More than 10,600 Canadians were killed and wounded in the assault. Today an iconic memorial atop the ridge honours the 11,285 Canadians killed in France throughout the war who have no known graves.

This is the full-length entry about the Battle of Vimy Ridge. For a plain-language summary, please see Battle of Vimy Ridge (Plain-Language Summary).