A photograph taken from atop Cemetery Hill, where Union artillery and infantry were massed during the Battle of Gettysburg, looks out upon the town of Gettysburg, Pennsylvania. The road at left leading into town is the Baltimore Pike. Timothy H. O'Sullivan took this photograph on July 7, 1863, four days after the battle. One of O'Sullivan's darkroom wagons is positioned midway down the stone wall on the right of the road. The tent encampment at center right is a Northern militia unit that arrived July 6 and remained for a month to guard the town in the aftermath of the bloody battle.
This image is included in the two-volume Gardner's Photographic Sketch Book of the War (1866), an influential work by the photographer Alexander Gardner that combined text and photographs to narrate the war. O'Sullivan worked for Gardner.