...n fought, it was ordered to join in the pursuit of Pope. The Fourth Regiment crossed the Rappahannock at Wallis' ford, and, marching through farms, regardless of roads, came into the main road from Culpepper Court-House to Fredericksburg, and turning to the right, attacked the cavalry protecting Pope's extreme left and drove it across the Rappahannock at Ellis' mill. Turning toward Brandy Station, on t...