Gettysburg Campaign. Crossing South Mountain from Chambersburg, Gen. Hill's Corps of Lee's army assembled here on June 29-30, 1863. On July 1, his advance guard moved up from near Marsh Creek and met Union troops west of Gettysburg. Old Rte. 30 just west of SR 3011, Cashtown, PA by Pennsylvania Historical and Museum Commission Colour: blue Wikimedia: Flickr: Google Streetview OpenStreetMap