High Quality Content by WIKIPEDIA articles! The Johnson County War, also known as the War on Powder River and the Wyoming Range War, was a range war that took place in Johnson, Natrona and Converse County, Wyoming in April 1892. It was fought between small settling ranchers against larger established ranchers in the Powder River Country and culminated in a lengthy shootout between local ranchers, a band of hired killers, and a sheriff`s posse, eventually requiring the intervention of the United States Cavalry on the orders of President Benjamin Harrison.