... to Manassas, however, there occurred a series of events that compelled him to retain the greater part of his force in the Shenandoah Valley. At the time of the evacuation of Manassas by the enemy, Stonewall Jackson , with his division of about eight thousand men, was posted at Winchester—the Union troops occupying Charlestown; but on the advance of General Banks' force, on the 12th of March, he retreated;...