I'm not sure if this image has been posted before ( I couldn't find it ) but it shows life in a Union camp. Some of the boys are gathered round to pose for the camera. A mock fencing duel between two contestants is the focus of the attention while their comrades look on. I notice that they are wearing dark blue trousers as opposed to the more common sky blue ones. The combatant on the right seems to be wearing an infantryman's set of leathers and holding a Colt revolver, while the one on the left has what looks like ( to me anyways ) an officers sword belt and a pepperbox pistol. Lots of detail in this pic.