patrick.net

In early 1857, several groups of emigrants from the northwestern Arkansas region started their trek to California, joining up on the way to form a group known as the Baker–Fancher party. The groups were mostly from Marion, Crawford, Carroll, and Johnson counties in Arkansas, and had assembled into a wagon train at Beller's Stand, south of Harrison, to emigrate to southern California. This group was initially referred to as both the Baker train and the Perkins train, but after being joined by other Arkansas trains and making its way west, was soon called the Baker–Fancher train (or party).

When a signal was given, the militiamen turned and shot the male members of the Baker–Fancher party standing by their side. The women and children were then ambushed and killed by more militia that were hiding in nearby bushes and ravines. Members of the militia were sworn to secrecy. A plan was set to blame the massacre on the Native Americans. The militia did not kill some small children who were deemed too young to relate the story. These children were taken in by local Mormon families. Seventeen of the children were later reclaimed by the U.S. Army and returned to relatives in Arkansas.

U.S. Army Brevet Major James Henry Carleton conducted investigations. In Carleton's investigation, at Mountain Meadows he found women's hair tangled in sage brush and the bones of children still in their mothers' arms. Carleton later said it was "a sight which can never be forgotten." After gathering up the skulls and bones of those who had died, Carleton's troops buried them and erected a cairn and cross.

https://en.wikipedia.org/wiki/Mountain_Meadows_massacre