General Johnston, surveying the whole field in Virginia, and penetrating, it would seem, the designs of the enemy, had hastened to direct General Jackson, commanding in the Valley, to begin offensive operations, and, by threatening the Federal force there—with Washington in perspective—relieve the heavy pressure upon the main arena. Jackson carried out these instructions with the vigor which marked all his operations. In March he advanced down the Valley in the direction of Winchester, and, coming upon a considerable force of the enemy at Kernstown, made a vigorous assault upon them; a heavy engagement ensued, and, though Jackson was defeated and compelled to retreat, a very large Federal force was retained in the Valley to protect that important region. A more decisive diversion soon followed. Jackson advanced in May upon General Banks, then at Strasburg, drove him from that point to and across the Potomac; and such was the apprehension felt at Washington, that President Lincoln ordered General McDowell, then at Fredericksburg with about forty thousand men, to send twenty thousand across the mountains to Strasburg in order to pursue or cut off Jackson.
Thus the whole Federal programme in Virginia was thrown into confusion. General Banks, after the fight at Kernstown, was kept in the Valley. After Jackson’s second attack upon him, when General Banks was driven across the Potomac and Washington threatened, General McDowell was directed to send half his army to operate against Jackson. Thus General McClellan, waiting at Richmond for McDowell to join him, did not move; with a portion of his army on one side of the stream, and the remainder on the other side, he remained inactive, hesitating and unwilling, as any good soldier would have been, to commence the decisive assault.