Confederate Gen. Robert E. Lee concentrated his army around Gettysburg, Pennsylvania, upon the approach of Union Gen. George G. Meade’s forces. On July 1, Confederates drove Union defenders through Gettysburg to Cemetery Hill. The next day Lee struck the flanks of the Union line resulting in severe fighting at Devil's Den, Little Round Top, the Wheatfield, Peach Orchard, Culp’s Hill and East Cemetery Hill. Southerners gained ground but failed to dislodge the Union host. On the morning of July 3rd, fighting raged at Culp’s Hill with the Union regaining its lost ground. That afternoon, after a massive artillery bombardment, Lee attacked the Union center on Cemetery Ridge and was repulsed with heavy losses in what is known as Pickett’s Charge. Lee's second invasion of the North had failed.