... to Grant and Sherman, and other commanders in the West, to give all possible aid to Rosecrans. Grant was then in New Orleans, disabled by a fall from his horse, and Sherman, who represented him at Vicksburg , did not receive the dispatch till several days after it was issued. Hearing nothing from either, and startled by the saddening news from the Chickamauga, Halleck at once, as we have observed, det...