When the Mormons established their theocratic city of Nauvoo on the banks of the Mississippi in 1839, they made self-defense a priority, having encountered persecution, violence, and forcible expulsion elsewhere. Organized under Illinois law, the Nauvoo Legion was a city militia made up primarily of Latter-day Saints. This comprehensive work on the history, structure, and purpose of the Nauvoo Legion traces its unique story from its founding to...