those we have already mentioned.
On the 9th of July, McDowell was ordered to make preparations for assuming the offensive in eight days, and at the same time General Scott gave him formal assurance that Patterson should keep Johnston so occupied in the Shenandoah Valley that he would find it impossible to go to the assistance of Beauregard; that if he attempted to do so, the forces opposed to him would follow so close that they would reach the banks of Bull Run at the same time.
On the 16th, the day fixed for the movement, there was nothing ready to transport the necessary provisions for the army.
McDowell was nevertheless obliged to begin his march.
He had four divisions with him—the fifth, Runyon's, remaining behind to protect the positions that the army was about to leave.
Tyler's division, four brigades strong, was ordered to incline to the right by the Leesburg road, and encamp at Vienna, in order to fall back, by a cross-movement, on Fairfax Court-house the following da