My Great great grandpa rode in the Missouri 4th. They finally surendered in Missiissippi. His loyalty was obvious. Another was in the Cass county Union militia, but that's fuzzy because many didn't have a choice and I don't know if he was one of them.
Funny story, another GGrandfathers brother, distant uncle, was a slave owner in Andrew county and also a member of the Union Militia. It was said he sweated a lot for fear that the yankees would find out.