The Marias Massacre (also known as the Baker Massacre or the Piegan Massacre) was a massacre of a friendly band of Piegan Blackfeet Indians on January 23, 1870 by the United States Army in Montana Territory during the Indian Wars. About 200 Indians were killed, mostly women and children, and elderly men.During a campaign to suppress Mountain Chief's band of Piegan Blackfeet, who harbored a man named Owl Child, said to have murdered a white trader and rancher, Malcolm Clarke, the U.S.