...mauga, Halleck at once, as we have observed, detached the Eleventh (Howard's) and Twelfth (Slocum's) corps from the Army of the Potomac, and sent them, under the general command of Hooker, to Middle Tennessee , with orders, until further directed, to guard Rosecrans's communications between Nashville and Bridgeport. These troops were moved with marvelous celerity under the wise direction of General Meigs...