The Mountain Meadows Massacre (September 7–11, 1857) was a series of attacks during the Utah War that resulted in the mass murder of at least 120 members of the Baker–Fancher wagon train.[1][a] The massacre occurred in the southern Utah Territory at Mountain Meadows, and was perpetrated by settlers from the Church of Jesus Christ of Latter-day Saints (LDS Church) involved with the Utah Territorial Militia (officially called the Nauvoo Legion) who recruited and were aided by some Southern Paiute Native Americans.[2] The wagon train, made up mostly of immigrant families from Arkansas, was bound for California, traveling on the Old Spanish Trail that passed through the Territory.

I don't see the similarity. This was a group of Mormons and militiamen killing settlers from Arkansas.