There were about 8 - 10,000 Missouri State Guardsmen present during the Battle of Lexington.
2nd Division - Brigadier General Thomas A. Harris3rd Division - Colonel Congrave Jackson (where was Brigadier General Charles Clark?)
4th Division - Colonel Benjamin A. Rives (Brigadier General William Y. Slack was absent)
5th Division - Brigadier General Alexander E. Steen
6th Division - Brigadier General Monroe M. Parsons
7th Division - Brigadier General James H. McBride
8th Division - Brigadier General James S. Rains
There were also an additional 10,000 or so ad hoc volunteers who had come to Lexington to join in and whip the Yankees.