This was left out of the story:
> At the height of the tensions, on September 11, 1857, at least 120 California-bound settlers from Arkansas, Missouri and other states, including unarmed men, women and children, were killed in remote southwestern Utah by a group of local Mormon militia. They first claimed that the migrants were killed by Natives but it was proven otherwise. This event was later called the Mountain Meadows Massacre and the motives behind the incident remain unclear.
> The Aiken massacre took place the following month. In October 1857, Mormons arrested six Californians traveling through Utah and charged them with being spies for the U.S. Army. They were released but were later murdered and robbed of their stock and $25,000.
> Other incidents of violence have also been linked to the Utah War, including a Native American attack on the Mormon mission of Fort Lemhi in eastern Oregon Territory, modern-day Idaho. They killed two Mormons and wounded several others. The historian Brigham Madsen notes, "[T]he responsibility for the [Fort Limhi raid] lay mainly with the Bannock." David Bigler concludes that the raid was probably caused by members of the Utah Expedition who were trying to replenish their stores of livestock that had been stolen by Mormon raiders.
[0]: https://en.wikipedia.org/wiki/Utah_War#Overview