On Nov. 21, 1927, Colorado National Guardsmen were mobilized and ordered to the Columbine Mine in Serene, Colo., after a clash between state policemen and strikers turned deadly.
Twelve miners were killed when the outnumbered policemen fired back at the attacking mob. There were countless wounded by the time the Colorado National Guardsmen arrived.
Once a large amount of National Guardsmen had reached their posts and had begun patrolling vigilantly, many miners began to report back to work, feeling more secure.
Much of the violence in these camps was directed toward replacement workers by strikers. The National Guard was often called in to quell this violence and foster a safer environment so that these miners could safely work.The Guardsmen were relieved of their duties there on March 31, 1928.