A Union cannon overlooks the farmland across which 12,000 Confederate troops advanced from the trees along Seminary Ridge, almost a mile away. It happened on the third and final day of the battle of Gettysburg and became known as Pickett's Charge. And it was a disastrous failure for Gen. Robert E. Lee and his Army of Northern Virginia.
This array of large boulders got its nickname well before the battle, supposedly for a large black snake that lived in the rocks.
Union forces occupied Devil's Den on day one of the battle. Confederates from Texas, Alabama and Georgia drove them away by evening, and thereafter used the boulders as cover for sharpshooters taking aim at Federal troops on Little Round Top.
