The Mountain Meaows massacre involved a mass slaughter of the Fancher-Baker emigrant wagon train at Mountain Meadows in the Utah Territory by the local Mormon militia in September 1857. It began as an attack, quickly turned into a siege, and eventually culminated on September 11, 1857, in the execution of the unarmed emigrants after their surrender. Local Paiute tribesmen recruited by the militia also participated in both the attack and the massacre.