When the wagon train, on its way to California, is attacked by Indians, it is in a mountainous area, yet the Indians are identified as Cheyenne. The Cheyenne tribe was a Great Plains tribe, and would not have been that far west.
Zebulon Prescott: O Lord, without consulting with Thee, we have sent thy way some souls whose evil ways passeth all understanding. We ask Thee humbly to receive them... whether you want them or not! Amen.