...sion commanders, in view of his better information as to Buell's real movements, fell back upon Perryville. Had General Bragg then, treating Sill's movement as secondary, concentrated his army at Perryville , the history of this campaign thence forward might have been different. He had, however, countermanded his order before he heard from General Polk, and on the 4th, upon the approach of Sill's caval...