When the Civil War began in 1861, the majority of Dallas County residents supported the Union. As such, there were no Confederate companies organized within Dallas County boundaries. However, some did leave the county to fight for the Confederate cause.
Men from Dallas County fought in several Union regiments. These included: Company 1, 8th Regiment, Missouri Volunteer Infantry, which included Lt. Thomas Franklin and James M. Reeser, raised in September 1862, and Company D, 15th Regiment, Missouri Volunteer Cavalry under Capt. T.B. Sutherland in November 1863, whose responsibility was to clear the county of bushwhackers.