During a general strike in Winnipeg, Canada, members of the Royal North-West Mounted Police attacked a crowd of strikers, armed with clubs and revolvers.

The Winnipeg General Strike of 1919 was one of the most famous and influential strikes in Canadian history. For six weeks, May 15 to June 26, more than 30,000 strikers brought economic activity to a standstill in Winnipeg, Manitoba, which at the time was Canada's third largest city. In the short term, the strike ended in arrests, bloodshed and defeat, but in the long run it contributed to the development of a stronger labour movement and the tradition of social democratic politics in Canada.

Winnipeg is the capital and largest city of the Canadian province of Manitoba. It is centred on the confluence of the Red and Assiniboine rivers. As of 2021, Winnipeg had a city population of 749,607 and a metropolitan population of 834,678, making it Canada's sixth-largest city and eighth-largest metropolitan area.

The North-West Mounted Police (NWMP) was a Canadian paramilitary police force, established in 1873, to maintain order in the new Canadian North-West Territories (NWT) following the 1870 transfer of Rupert's Land and North-Western Territory to Canada from the Hudson's Bay Company, the Red River Rebellion and in response to lawlessness, demonstrated by the subsequent Cypress Hills Massacre and fears of United States military intervention. The NWMP combined military, police and judicial functions along similar lines to the Royal Irish Constabulary. A small, mobile police force was chosen to reduce potential for tensions with the United States and First Nations. The NWMP uniforms included red coats deliberately reminiscent of British and Canadian military uniforms.