Two things:
1.) This looks a lot like a vignette I did in the late 70's using three Airfix 8th Army multipose figures which I titled "Requiem for Tommy". The main differnce is the fallen guy had already been burried and was represented by a mound.
2.)
http://www.milminwh.com/shen_2.htm " TARGET="_blank"> http://www.milminwh.com/shen_2.htm The first guy in the list is a Confederate, but he's American, too. A very nice sculting with a choice of kepi and bearded head or clean shaven with slouch hat.
http://www.milminwh.com/feudo_54.htm " TARGET="_blank"> http://www.milminwh.com/feudo_54.htm This first guy is kind of big and I didn't like the face, but he's Union.
http://www.milminwh.com/art_girona_54acw.htm " TARGET="_blank"> http://www.milminwh.com/art_girona_54acw.htm While not a standard bearer,his pose might fit the mood. A very well done figure. Ignore the green tint to the artwork, the uniform is blue and the sash is more likley crimson for a lieutenant.