Lewis and Clark in Kentucky- Kentucky Militia. State militia law (1792) required Kentuckians on the 1803-1806 Lewis and Clark Expedition to serve in the Kentucky Militia, predecessor to the Kentucky National Guard. Records verify the militia service of William Clark and William Bratton. Over. (Reverse) May 1800, Clark became captain of Jefferson Co. cavalry company in the 33rd Regt. During War of 1812, Bratton was private in 1st Rifle Regt., from Franklin Co. Captured at Battle of River Raisin on Jan. 22, 1813, was exchanged and was discharged on March 27, 1813.