At this point, the Union soldiers continued the attack against the remaining lines, seeking refuge near the crest of the ridge (the top line of rifle pits was sited on the actual crest rather than the military crest of the ridge, leaving blind spots). This second advance was taken up by the commanders on the spot, but also by some of the soldiers who, on their own, sought shelter from the fire further up the slope. The Union advance was disorganized, but effective, finally overwhelming and scattering what ought to have been, as General Grant himself believed, an impregnable Confederate line. In combination with an advance from the southern end of the ridge by divisions under Maj. Gen. Joseph Hooker, the Union Army routed Bragg's army, which retreated to Dalton, Georgia, ending the siege of Union forces in Chattanooga, Tennessee.