...ndoned Chattanooga with the sole design of striking us in detail as we followed in pursuit; and to prevent his achieving this purpose orders came at 12 o'clock, midnight, for McCook to draw in toward Chattanooga . This could be done only by recrossing Lookout Mountain, the enemy's army at Lafayette now interposing between us and Thomas's corps. The retrograde march began at once. I moved back over the m...