"Iron Brigade General - John Gibbon, A Rebel in Blue" by Dennis Lavery & Mark Jordan (1993), with a forward by Alan T. Nolan, includes two chapters detailing Gibbon's role as commander of the military district of Montana in the 1870's, leading the 7th Infantry Regiment, and his rescue of the Little Big Horn survivors. The book provides interesting insight into Civil War generals who later led the Army during the western expansion and Indian wars - Sheridan, Custer, McDowell, Hancock, Terry, Reno, others.