The War Measures Act was a Canadian statute that allowed the government to assume sweeping emergency powers, stopping short of martial law, i.e. the military does not administer justice, which remains in the hands of the courts. The Act has been invoked three times: During World War I, World War II, and the October Crisis of 1970. In 1988, the War Measures Act was replaced by the Emergencies Act.
Prior to 1837, martial law was proclaimed and applied in the territory of the Province of Quebec during the invasion of Canada by the army of the American Continental Congress in 1775-1776.
It was also applied twice in the territory of Lower Canada during the 1837-1838 insurrections. On December 5, following the events of November 1837, martial law was proclaimed in the district of Montréal by Governor Gosford, without the support of the Legislative Assembly in the Parliament of Lower Canada. It was imposed until April 27, 1838. Martial law was proclaimed a second time on November 4, 1838, this time by acting Governor John Colborne, and was applied in the district of Montreal until August 24, 1839.[2]