In the campaign we are describing Jackson was the most active and conspicuous figure on the Confederate side. He rested at Gordonsville for two weeks, recuperating his health and that of the army, which had been much impaired in the malarial district of the Peninsula. The fresh mountain air blowing down from the Blue Ridge soon brought back their wonted vigor. On July 27th A. P. Hill was ordered to join him, and the Confederate leader now had about twenty-five thousand men. The movement on Gordonsville was exactly in accordance with Jackson's own ideas which he had urged upon Lee. Although believing McClellan to be in an impregnable position on the Peninsula, it was not less evident to him that the Union general would be unable to move further until his army had been reorganized and reënforced. This was the moment, he argued, to strike in another direction and carry the conflict into the Federal territory. An army of at least sixty thousand should march into Maryland and appear before the National Capital. President Davis could not be won over to the plan while McClellan was still in a position to be reënforced by sea, but Lee, seeing that McClellan remained inactive, had determined, by sending Jackson westward, to repeat the successful tactics of the previous spring in the Shenandoah valley. Such a move might result in the recall of McClellan. And so it happened. No sooner had Halleck assumed command of all the Northern armies than the matter of McClellan's withdrawal was agitated and on August 3d the head of the Army of the Potomac, to his bitter disappointment, was ordered to join Pope on the Rappahannock. Halleck was much concerned as to how Lee would act during the Federal evacuation of the Peninsula, uncertain whether the Confederates would attempt to crush Pope before McClellan could reënforce him, or whether McClellan would be attacked as soon as he was out of his strong entrenchments at Harrison's Landing. The latter of the two possibilities seemed the more probable, and Pope was therefore ordered to push his whole army toward Gordonsville, in the hope that Lee, compelled to strengthen Jackson, would be too weak to fall upon the retiring Army of the Potomac. The Union army now occupied the great triangle formed roughly by the Rappahannock and the Rapidan rivers and the range of the Blue Ridge Mountains, with Culpeper Court House as the rallying point. Pope soon found that the capturing of New Madrid and Island No. 10 was easy in comparison with measuring swords with the Confederate generals in the East.