Of course, you're referencing the Mountain Meadows Massacre, the FIRST 9/11 domestic terrorist acts done on American soil (Sept. 11, 1857) -- and perpetrated by the Mormons upon innocent wagon trainers passing through Southern Utah.
Perhaps you should ask MonkeyFace 'bout this. She once claimed on an FR thread that she had ancestors who didn't survive the MMM. (Of course, she didn't say which side these ancestors were on -- if they were victims or part of the perpetrators...as in the initial part of the siege the Arkansas group fired back when attacked).