June 1 – On this day in Montana history in 1873 what is now known as the Cypress Hills Massacre took place on the wooded hills just north of what is now the Montana-Canada border. Traders and wolfers from Fort Benton had crossed the border trying to recover stolen property. They wiped out an Assiniboine camp of 50 lodges killing at least 20, many of them women and children. The incident angered the Canadian government and led to major efforts to send more mounted policed to the area and attempt to bring the Americans to trial and stop the whiskey trade coming into Canada from Fort Benton.