The marker to the German (South Carolina) Artillery is south of Gettysburg on South Confederate Avenue. (South Confederate Avenue tour map) The battery was commanded at the Battle of Gettysburg Gettysburg by Captain William K. Bachman and brought 71 men to the field.
From the marker:
July 2. In reserve near here but not engaged.
July 3. In position here and actively engaged in firing upon the Union lines within range. About 5 P. M. aided in repelling cavalry under Brig. Gen. Farnsworth which had charged into the valley between this point and Round Top.
July 4. Occupied position near by and west of this until 6 P. M. Then withdrew from the field.
See more on the history of the German (South Carolina) Artillery in the Civil War.