This is a based on true events " The Johnson County War, also known as the War on Powder River and the Wyoming Range War, was a range conflict that took place in Johnson County, Wyoming from 1889 to 1893. The conflict began when cattle companies started ruthlessly persecuting alleged rustlers in the area, many of whom were settlers who competed with them for land, livestock and water rights. As violence swelled between the large established ranchers and the smaller settlers in the state, it finally culminated in the Powder River Country when the ranchers hired gunmen to invade the county. The gunmen's initial incursion in the territory aroused the small farmers and ranchers, as well as the state lawmen, and they formed a posse of 200 men that led to a grueling stand-off. The siege ended when the United States Cavalry on the orders of President Benjamin Harrison relieved the two forces, although further fighting persisted in the following months."