The Bluff War, also known as Posey War of 1915, or the Polk and Posse War, was one of the last armed conflicts between the United States and native Americans. It began in March 1914 and was the result of an incident between a Utah shepherd and Tse-ne-gat, the son of the Paiute Chief Polk. It was notable for involving Chief Posey and his band of renegades who helped Polk fight a small guerrilla war against local Mormon settlers and Navajo policemen.