I do. Mountain Meadows Massacre.
Yup. It was committed through Mormon treachery. A very dark stain on the Mormons.
I would never have put it together if you hadn’t mentioned the massacre. Reading the wiki article, Nauvoo Legion and Nauvoo Mission were mentioned. Nauvoo was also the name of the huge space ship the Mormons built to seek their destiny in the Netflix series, “The Expanse”. The good guys commandeered it to save the planetary system.
Just one of those things I learned while looking up other things...always fun.
Thanks!