...resh horses since the Sharpsburg battle. At last on October 26th, three weeks after he had received orders, he began crossing his army over the Potomac into Loudoun County, Va., at Berlin, below Harper's Ferry . This occupied nine days. A slow concentration of his army in the direction of Warrenton followed. Lee met this movement, and later, on November 3d, marched Longstreet's corps to Culpeper Court H...