following the defeat of Rosecrans' Army at Chickamauga, in September, 1863, Bragg at once took strong positions on Missionary Ridge and Lookout Mountain. From these heights he was able to besiege the entire Army of the Cumberland in Chattanooga and obstruct the main arteries of supply to the Federal troops. Rosecrans was forced to abandon the route along the south bank of the Tennessee River, which led from Bridgeport, in Alabama, and to depend exclusively upon a long and mountainous wagon road on the north side of the River for the transportation of supplies. The Confederate cavalry, crossing the Tennessee above Chattanooga, fell upon the trains entangled in the mud of the Sequatchie valley, destroying in one day three hundred wagons, and killing or capturing about eighteen hundred mules. Within a short time the wisdom of Bragg's plan became apparent; famine threatened the Union Army and several thousand horses and mules had already died from starvation. By his relentless vigil, the Confederate leader seemed destined to achieve a greater victory over his opponent than had hitherto attended his efforts in actual conflict.