On July 30, McClellan received a preliminary order to send away his sick, and the withdrawal of his entire force was ordered by telegraph on August 3. With the obstinacy and persistence that characterized his course from first to last, McClellan still protested against the change, and when Halleck in a calm letter answered his objections with both the advantages and the necessity of the order, McClellan's movement of withdrawal was so delayed that fully eleven days of inestimable time were unnecessarily lost, and the army of Pope was thereby put in serious peril. Meanwhile, under President Lincoln's order of June 26, General Pope had left the West, and about the first of July reached Washington, where for two weeks, in consultation with the President and the Secretary of War, he studied the military situation, and on July 14 assumed command of the Army of Virginia, consisting of the corps of General Fremont, eleven thousand five hundred strong, and that of General Banks, eight thousand strong, in the Shenandoah valley, and the corps of General McDowell, eighteen thousand five hundred strong, with one division at Manassas and the other at Fredericksburg. It is unnecessary to relate in detail the campaign which followed. Pope intelligently and faithfully performed the task imposed on him to concentrate his forces and hold in check the advance of the enemy, which began as soon as the Confederates learned of the evacuation of Harrison's Landing. When the Army of the Potomac was ordered to be withdrawn it was clearly enough seen that the movement might put the Army of Virginia in jeopardy; but it was hoped that if the transfer to Acquia Creek and Alexandria were made as promptly as the order contemplated, the two armies would be united before the enemy could reach them. McClellan, however, continued day after day to protest against the change, and made his preparations and embarkation with such exasperating slowness as showed that he still hoped to induce the government to change its plans. Pope, despite the fact that he had managed his retreat with skill and bravery, was attacked by Lee's army, and fought the second battle of Bull Run on August 30, under the disadvantage of having one of McClellan's divisions entirely absent and the other failing to respond to his order to advance to the attack on the first day. McClellan had reached Alexandria on August 24; and notwithstanding telegram after telegram from Halleck, ordering him to push Franklin's division out to Pope's support, excuse and delay seemed to be his only response, ending at last in his direct suggestion that Franklin's division be kept to defend Washington, and Pope be left to "get out of his scrape" as best he might.