Battery A, Fourth U.S. Artillery, Robertson’s Brigade
This is one of the celebrated horse batteries of the Army of the Potomac. In the batteries designed for cavalry
service, every man was mounted, except in action, when the cannoniers
necessarily served the guns on foot. The picture represents the four 12-pounder light brass pieces “in
battery,” with limbers and caissons to the rear, and on the left the battery
wagon, forge, ambulance, and wagons for transportation, embracing the entire
equipage of a light battery in the field. Beyond, another battery is seen in camp. The horses being hitched in, and limber chests open, would seem
to indicate that an inspection is about to be made. Just in the edge of the woods is brigade headquarters.
Gardner’s Photographic Sketchbook of the Civil War - Plate 59