A potent fighting force that changed the course of the Civil War, the Army of the Cumberland was the North's second-most-powerful army, surpassed in size only by the Army of the Potomac. The Cumberland army engaged the enemy across five times more territory with one-third to one-half fewer men than the Army of the Potomac, and yet its achievements in the western theater rivaled those of the larger eastern army. In Days of Glory, Larry J. Daniel...