Having concentrated his army around the small town of Gettysburg, Pennsylvania, Gen. Robert E. Lee awaited the approach of Union Gen. George G. Meade’s forces. On July 1, early Union success faltered as Confederates pushed back against the Iron Brigade and exploited a weak Federal line at Barlow’s Knoll. The following day saw Lee strike the Union flanks, leading to heavy battle at Devil's Den, Little Round Top, the Wheatfield, Peach Orchard, Culp’s Hill and East Cemetery Hill. Southerners captured Devil’s Den and the Peach Orchard, but ultimately failed to dislodge the Union defenders. On the final day, July 3rd, fighting raged at Culp’s Hill with the Union regaining its lost ground. After being cut down by a massive artillery bombardment in the afternoon, Lee attacked the Union center on Cemetery Ridge and was repulsed in what is now known as Pickett’s Charge. Lee's second invasion of the North had failed, and had resulted in heavy casualties; an estimated 51,000 soldiers were killed, wounded, captured, or listed as missing after Gettysburg.