Troop A of the First Cavalry, Sixth Division, was organized in Miller County in May, 1861. The unit was known as the Osage Tigers. At least one book (Piston and Hatcher) lists the unit as fighting at the Battle of Wilson's Creek. A list of the men is available on pages 79 and 80 of Kenneth Weant's "Missouri State Guard Cavalry Regiments." As luck would have it I have a copy of page 79 which ends with the surname Wilks. I believe there are copies in both Columbia and Jefferson City public libraries. If that's not convenient, you can use worldcat.org to find a copy near you. Good luck!