...ed on eminent ground as rear-guard, and organized retreat followed. It was not until after sunset that Rosecrans's order for retreat was issued, as appears from the letter written from Rossville by General James A. Garfield , chief of staff, dated 8.40, three hours and more after the move was taken up, viz.: Your order to retire to this place was received a little after sunset and communicated to Generals Thomas and Gran...