...slodge that force before concentrating his army west of the mountains, and to this duty Jackson, with his own three divisions, 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 ...