Smith departed Knoxville on August 13 , Bragg left Chattanooga on August 27 .
General Braxton Bragg , commanding the Army of Mississippi , moved on a roughly parallel track to the west .
Smith departed Knoxville on August 13 , General left Chattanooga on August 27 .
General Braxton Bragg , commanding the Army of Mississippi , moved on a roughly parallel track to the west .