“We believe it is our obligation to understand and learn from the past,” Elder Henry B. Eyring, then of the Quorum of the Twelve Apostles, remarked on Sept. 11, 2007, at an event commemorating the 150th anniversary of the Mountain Meadows Massacre. The massacre is perhaps the grimmest episode in the history of The Church of Jesus Christ of Latter-day Saints — when brewing tensions between early Church pioneers and immigrants traveling through the Utah Territory erupted, resulting in the death of some 100 people. In 2008, the book “Massacre at Mountain Meadows” explored the complicated history of the 1857 event. The sequel, “Vengeance Is Mine: The Mountain Meadows Massacre and Its Aftermath,” is now available. Authors Richard E. Turley Jr. and Barbara Jones Brown join this episode of the Church News podcast to talk about this period in Church history.