with his corps; then moved by Ashby's and Snicker's Gaps into the Valley, and likewise crossed the Potomac river, leaving to General Stuart the task of holding the gaps of the Blue Ridge Mountains with his corps of cavalry.
The Federal commander had meanwhile moved his army so as to cover Washington City; and, as soon as. he was thoroughly informed, by Ewell's rapid advance, of the real intention of his adversary, he, too, crossed into Maryland.
On the 27th of June, General Lee was near Chambersburg with the First and Third Corps, the Second being still in advance, but within supporting distance.
With the exception of the cavalry, the army was well in hand.
The absence of that indispensable arm of the service was most seriously felt by General Lee.
He had directed General Stuart to use his discretion as to where and when to cross the river — that is, he was to cross east of the mountains, or retire through the mountain passes into the Valley and cross in the immediate rear of the