...gly, he shipped off a large portion of lds force to the vicinity of Portress Monroe, leaving McDowell, with a comparatively small army, to guard the Rappahannock. By the aid of the gunboats on the James and York rivers, he fought his way along the Yorktown peninsula, the Confederate army retreating before him till it had passed the Chickahominy, when it made a stand under the walls of Richmond. No...