...hile the cannonading on both sides continued, until ordered to fall back on Huntsville. Human endurance could stand no further tax. Some of the cavalry were dispatched to protect the flanks, or, as Colonel Greer expressed it, to keep the cavalry out of the way of the infantry bringing up the rear of the retreating army. Col. Evander McNair, who succeeded to the command of Hebert's brigade, said in his re...