Confederate Artillery Batteries
“Garden’s Battery”
The marker for the Palmetto (South Carolina) Artillery is southwest of Gettysburg on South Confederate Avenue. (Tour map: South Confederate Avenue) The battery was commanded at Gettysburg by Captain Hugh R. Garden.
From the marker:
Army of Northern Virginia
Longstreet’s Corps Hood’s Division
Henry’s Battalion Garden’s Battery
The Palmetto Artillery
Two Napoleons Two 10 Pounder Parrotts
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 pm. 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.
Losses not reported in detail.

The photo looks southwest past the marker and a Napoleon similar to those used by the battery. Big Round Top is in the distance.
See more on the history of the Palmetto (South Carolina) Light Artillery in the Civil War.