Law led his brigade through the Peninsula Campaign and the Seven Days Battles. At Gaines' Mill, he and fellow brigade commander Brig. Gen. John Bell Hood achieved fame by breaking the center of the Union line. They attacked in tandem again at the Battle of Malvern Hill four days later, but were defeated decisively. In the Northern Virginia Campaign, at the Second Battle of Bull Run, Law and Hood were used again as the primary assaulting force in Longstreet's surprise attack against the Union left flank, almost destroying Maj. Gen. John Pope's Army of Virginia.