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12e Régiment blindé du Canada (12e RBC) is the junior of three regular armoured regiments in the Canadian Army. The regiment was established in 1871 as a militia infantry battalion and was converted to an armoured regiment in 1936. In 1968, the Regular Force regiment was formed, designated 12e RBC. The regiment or detached squadrons have served in peace operations and in Afghanistan. 12e RBC has been based at CFB Valcartier, Quebec, since 1968 and is part of 5 Canadian Mechanized Brigade Group, 2nd Canadian Division.

To celebrate its 30th anniversary, The Canadian Encyclopedia created 30 lists of 30 things that have helped define our identity, from famous people and historic events, to iconic foods and influential artists.

Aid to (or of) the Civil Power, the calling out of military troops by the civil authorities to help maintain or restore public order.

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.

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.)

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 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.

CANLOAN was a volunteer program that loaned Canadian officers to the British Army during the Second World War.

Exercise Tocsin B was a nationwide nuclear preparedness drill that lasted 24 hours between 13 and 14 November 1961. It was the last of three national survival exercises named Tocsin in 1960–61. It was also the largest and most widely publicized civil defence drill ever held in Canada. This Cold War exercise run by the Canadian Army simulated the impact of thermonuclear warfare in Canada. Its goals were to show how the state would warn Canadians of such an attack and how government would continue during the crisis. By raising popular awareness of the potential for a devastating nuclear attack, Tocsin B showed Canadians what was at stake in the Cold War.

The First World War of 1914–1918 was the bloodiest conflict in Canadian history, taking the lives of nearly 61,000 Canadians. It erased romantic notions of war, introducing slaughter on a massive scale, and instilled a fear of foreign military involvement that would last until the Second World War. The great achievements of Canadian soldiers on battlefields such as Ypres, Vimy and Passchendaele, however, ignited a sense of national pride and a confidence that Canada could stand on its own, apart from the British Empire, on the world stage. The war also deepened the divide between French and English Canada and marked the beginning of widespread state intervention in society and the economy. (This is the full-length entry about the First World War. For a plain-language summary, please see First World War (Plain-Language Summary).)

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.

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.

See Armaments; Armed Forces; Aviation, Military; Korean War; South African War; War of the Austrian Succession; War of the Spanish Succession; War of 1812; World War I, World War II; and individual battle entries.

Militia Acts provided manpower for defence. Until the 1850s, such Acts in Upper and Lower Canada, Nova Scotia and New Brunswick usually imposed compulsory service on males between 16 and 50 or 60, with annual or more frequent enrolment musters.

On 6 June 1944, Canadian Forces landed on Juno Beach. D-Day was the largest amphibious invasion of all time and marked the beginning of the end of the Second World War. In 2019, Historica Canada released a Heritage Minute telling the story of 47-year-old Major Archie MacNaughton, a First World War veteran and leader of the North Shore New Brunswick Regiment’s A Company. In this article, Anthony Wilson-Smith, president of Historica Canada, reflects on the making of the D-Day Minute.