...isions, the two divisions of McLaws, and the division of Walker, was assigned. Jackson was to proceed by way of Sharpsburg, crossing the Potomac above Harper's Ferry, and, investing it by the rear; McLaws was to move by way of Middletown on the direct route to the ferry, and seize the hills on the Maryland side known as Maryland Heights; Walker was to cross the Potomac below Harper's Ferry and take po...