Longstreet counterattacked with the divisions of Maj. Gen. Charles W. Field and Brig. Gen. Joseph B. Kershaw. The Union troops fell a few hundred yards back from the Widow Tapp farm. At 10 a.m., Longstreet's chief engineer reported that he had explored an unfinished railroad bed south of the Plank Road and that it offered easy access to the Union left flank. Longstreet's aide, Lt. Col. Moxley Sorrel, and the senior brigade commander, Brig. Gen. William Mahone, struck at 11 a.m. with four brigades. At the same time, Longstreet resumed his main attack, driving Hancock's men back to the Brock Road, but the momentum was lost when Longstreet was wounded by his own men, putting him out of action until October.