He is noted for his actions in Missouri in 1861, at the beginning of the conflict, to forestall secret secessionist plans of the governor Claiborne Jackson. ORIGINAL CDV PHOTOGRAPH OF AN PERIOD ENGRAVING OF BRIGADIER GENERAL NATHANIEL LYON 1861. PHOTOGRAPHERS IMPRINT ON THE REVERSE. DIMENSIONS: W 2 3/8" x H 3 3/4". THIS IS NOT A REPRODUCTION OR COPY.