April 5 – On this day in Montana History in 1872 what became known as the first battle of Cypress Hills occurred. There now appears to be little doubt that a group of wolvers working the area mistook some Assiniboines for Piegans or Bloods who had stolen some of their horses and attacked them. This was the first event in what eventually led to the tragic Cypress Hills massacre which occurred in Canada in the spring of 1873.