On the day after the battle of Bull Run General George B. McClellan was summoned to Washington, where he arrived on July 26. On the 25th he had been assigned to the command of the army of the Potomac. By all the light which President Lincoln had at the time of making this appointment, it seemed the best that was possible; and in fact it was so, in view of the immediate sphere of usefulness of a commanding general in Virginia. McClellan was thirty-four years old, of vigorous physique and fine address. After his graduation at West Point, in 1846, he was attached to the Engineer Corps; he served through the Mexican war, and for merit received a captaincy. In 1855 he was sent by Jefferson Davis, then secretary of war, to Europe to study the organizing and handling of armies in active service; and he was for a while at the British headquarters during the siege of Sebastopol, observing their system in operation. In January, 1857, he resigned from the army; but with the first threatenings of the civil war he made ready to play an active part. April 23, 1861, he was appointed by the governor of Ohio a major-general, with command of all the state forces. May 13, by an order from the national government, he took command of the Department of the Ohio, in which shortly afterward Western Virginia was included. He found the sturdy mountaineers of this inaccessible region for the most part loyalists, but overawed by rebel troops, and toward the close of May, upon his own sole responsibility, he inaugurated a campaign for their relief. In this he had the good fortune to be entirely successful. By some small engagements he cleared the country of armed Secessionists and returned it to the Union; and in so doing he showed energy and good tactical ability. These achievements, which later in the war would have seemed inconsiderable, now led to confidence and promotion. In his new and exalted position McClellan became commander of a great number of men, but not of a great army. The agglomeration of civilians, who had run away from Manassas under the impression that they had fought and lost a real battle, was utterly disorganized and demoralized. Some had already reached the sweet safety of the villages of the North; others were lounging in the streets of Washington and swelling the receipts of its numerous barrooms. The majority, it is true, were in camp across the Potomac, but in no condition to render service. All, having been enlisted for three months, now had only a trifling remnant of so-called military life before them, in which it seemed to many hardly worth while to run risks. The new call for volunteers for three years had just gone forth, and though troops began to arrive under it with surprising promptitude and many three months' men reënlisted, yet a long time had to elapse before the new levies were all on hand. Thus betwixt departing and coming hosts McClellan's duty was not to use an army, but to create one.