Don Carlos Buell
On June 10, 1862, Union Maj. Gen. Don Carlos Buell, commanding the Army of the Ohio, started a leisurely advance toward Chattanooga. Brig. Gen. James S. Negley and his force threatened the city on June 7–8. In response to the threat, the Confederate government sent Brig. Gen. Nathan Bedford Forrest to Chattanooga to organize a cavalry brigade. By July, Confederate cavalry under the command of Forrest and Colonel John Hunt Morgan were raiding into Middle Tennessee and Kentucky.