When North and South met among the desolate mountains of northwestern Georgia in 1863, they began one of the bloodiest and most decisive campaigns of the Civil War. The climactic Battle of Chickamauga lasted just two days, yet it was nearly as costly as Gettysburg, with casualties among the highest in the war. In this study of the campaign, the first to appear in over thirty years and the most comprehensive account ever written on Chickamauga,...