Sumner replied "Impossible!? Sir, I tell you I can cross. I am ordered!" The first II Corps brigade to arrive on the field was Brig. Gen Willis Gorman's brigade of Brig. Gen John Sedgwick's division, which contacted the attack of Col. Evander Law's brigade. Law's attack was initiated by Col. William Dorsey Pender of the 6th NC and was later assisted by the brigades of Brig. Gen. J. Johnston Pettigrew and Col. Wade Hampton III. The three brigades experienced no success as Sumner brought forth two additional brigades and another battery of artillery from Sedgwick's division. During the final attack, Confederate Brig. Gen. Robert Hatton, one of the Army of Virginia's newest brigadiers, having just been promoted from colonel of the 7th Tennessee on May 23, 1862, was shot in the head leading his brigade into action and died instantly. Hampton, meanwhile, was shot in the ankle. Brig. Gen J. Johnston Pettigrew was gravely wounded and left for dead on the field, later being taken prisoner by Sedgwick's division. The repeated assaults on Sedgwick's line were unsuccessful, as the latter's artillery also pounded Whiting's troops, who had no artillery to answer back. A final surge by Whiting's four brigades resulted in a heavy loss of casualties as Sumner mounted a counterattack that drove the Confederate force from the field. It was after this counterattack that Pettigrew was discovered and sent to a Union field hospital for the care of his wounds. Shortly before Sumner's counter attack, Johnston received two wounds and was removed from the field. Command of the army transferred to Maj. Gen. Gustavus Smith. With darkness approaching, over 1200 casualties, and most of his officers killed or wounded, Whiting called off the attacks. Sedgwick's division had lost less than 400 men. Two of Magruder's brigades reached the field at dusk, but had no involvement in any of the fighting. Whiting's fifth brigade, the famous Texas Brigade of Brig. Gen John B. Hood, had not fought either; it had been sent off to reinforce Longstreet and was stationed in the woods some distance to the west of Fair Oak Station. The most historically significant incident of the day occurred around dusk, when Johnston was struck in the right shoulder by a bullet, immediately followed by a shell fragment hitting him in the chest. He fell unconscious from his horse with a broken right shoulder blade and two broken ribs