...umbers at every advance, created an effect upon our lines. At 4 o'clock the "left centre," as described by Gen. Bragg--a level point lying near Walkins's house, between the foot of Lookout and Missionary Ridge , and opening a way into the valley in rear — gave way, and the enemy poured through the embrasure like a flood tide. This cut the army in twain, and when it was observed by the troops upon th...