...troops for the purpose in the Shenandoah Valley, and with from 15,000 to 20,000 men, of all arms, he swept rapidly down the valley towards Williamsport. General Sigel, too weak to resist, fled into Maryland , with a heavy loss of stores, and General Weber, in command at Harper's Ferry, retired to Maryland Heights. Early crossed the Potomac at Williamsport, and pushing on to Hagerstown, July 6, 1864, le...