Van Horn's Battalion, US Reserve Corps, Missouri Infantry (Union)

Organized at St. Louis, Mo., by authority of Gen. Lyon May 1, 1861, and mustered into service at Kansas City, Mo., May 24. Expedition from Kansas City to relief of Col. Nugent at Austin, Cass County, Mo., July 18-25. Action at Harrisonville July 19. Capture of Harrisonville July 20. March to relief of Lexington, Mo., September 6. Siege of Lexington September 11-21. Surrendered to Price September 21. Mostly mustered out October 29, 1861. Balance transferred to 25th Missouri Infantry December, 1861.