American Civil War Uniforms- The Union and the Confederacy wore different uniforms to distinguish from eachother during the Civil War. The Union typically wore navy blue long frock coats while the Confederates wore grey on frock coats that were a tad shorter.
A rare image . . . from the look of these soldiers this is a late civil War photo of a battle-hardened company. A company would have started with around 100 men, there were no replacements. After a hard campaign between caualties and disease this is what might be left . . .