The First Kansas Colored Volunteers, a Union regiment, wore gray uniforms. At the Battle of Wilson's Creek, the detachment of the Union army under Col. Franz Sigel confused the advancing 3rd Louisiana for the
In Missouri, many local militia had no uniforms at all. The Union militia near Lancaster wore white hatbands to show who they were. On October 18, 1862, a large troop of them were hunting some rebel bushwhackers. The rebels decided the militia's "uniform" was easy to imitate and made themselves some white hatbands. The poor militia let most of them escape, even though they greatly outnumbered the rebels. They simply didn't know who was who!