You should read the account of the Mountain Meadows Massacre written in MASSACRES OF THE MOUNTAINS by Dunn Jr.Published back in 1880s. Brutal! Chapter X. The Fancher train was not the only one attacked. The Shephard and Mitlmore trains were also attacked by “Indians” with beards.
https://archive.org/details/massacresofmount0000jpdu/page/n4/mode/1up
The show depicts the attack as a joint effort of “Nauvoo Legion” Mormon militia wearing hoods and Paiute Indians, who were most definitely not portrayed as “noble savages” —only savages. The Mormons, to include Brigham Young, are portrayed as a violent cult.
I was very surprised to see this from Netflix.
Also, the cinematography is excellent.
I have an original copy of that book. My grandmother gave it to me many years ago.