...ons at Harper's Ferry-General Ewell crossed the Potomac river with his three divisions in the latter part of June, and, in pursuance of the orders of General Lee, traversed Maryland and advanced into Pennsylvania . General A. P. Hill, whose corps was the last to leave the line of the Rappahannock, followed with his three divisions in Ewell's rear. General Longstreet covered these movements with his corps; th...