Mormons, with a few Indians, killed 120 members of a wagon train heading west on Sept. 11, 1857.

Mountain Meadows massacre

The Mountain Meadows massacre was a series of attacks on the Baker–Fancher emigrant wagon train at Mountain Meadows in southern Utah. The attacks culminated on September 11, 1857, with the mass slaughter of most in the emigrant party by members of the Utah Territorial Militia from the Iron County district, together with some Paiute Native Americans.

• http://en.wikipedia.org/wiki/Mountain Meadows massacre
• Krakauer, J., 2003, Under the Banner of Heaven: A Story of Violent Faith: First Anchor Books, New York, 399p.