A group of Union officers including Captain James Robertson (third from left) posing with a cannon in camp at Fair Oaks, Virginia, 1862. By James F. Gibson. Animated stereoscopic photographs.
Source.

A group of Union officers including Captain James Robertson (third from left) posing with a cannon in camp at Fair Oaks, Virginia, 1862. By James F. Gibson. Animated stereoscopic photographs.

Source.