Volunteer groups representing Union and Confederate troops provide a weekend of "living history" at Gettysburg National Military Park. This weekend it`s the Society of Civil War Surgeons camp and programs at the Pennsylvania Monument, Auto Tour Stop No. 12, the Liberty Grays camp and programs at Pitzer Woods, Auto Tour Stop No. 6, and the 44th Georgia Infantry camp and programs at Spangler`s Spring, Auto Tour Stop No. 13.