The Black Hawk Indian War was the longest and most destructive conflict between pioneer immigrants and Native Americans in Utah History. The traditional date of the war's commencement is 9 April 1865 but tensions had been mounting for years. On that date bad feelings were transformed into violence when a handful of Utes and Mormon frontiersmen met in Manti, Sanpete County, to settle a dispute over some cattle killed and consumed by starving Indians. An irritated (and apparently inebriated) Mormon lost his temper and violently jerked a young chieftain from his horse. The insulted Indian delegation, which included a dynamic young Ute named Black Hawk, abruptly left, promising retaliation. The threats were not idle - for over the course of the next few days Black Hawk and other Utes killed five Mormons and escaped to the mountains with hundreds of stolen cattle. Naturally, scores of hungry warriors and their families flocked to eat "Mormon beef" and to support Black Hawk, who was suddenly hailed as a war chief.
[Utah History Encyclopedia: Black Hawk War, http://www.uen.org/utah_history_encyclopedia/]