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Utah historians, David L. Bigler and Will Bagley, tell the story of Johnston's Army, sent by President James Buchanan in 1857 to the Utah territory and the Mormon Nauvoo Legion that was prepared for their arrival. See the link to the Oklahoma Univeristy Press website for a full synopsis. 
http://www.oupress.com/ECommerce/Book/Detail/1527/the%20mormon%20rebellion