From the 1915 History of Osage County:
" In August 1861, Capt. J.K. Kidd organized the Osage Independent Mounted Rifle Company, which he took to St Louis. In the fall of 1861, Col. George B. Boomer of Castle Rock recruited, from the Home Guards, the Twenty-sixth Missouri Volunteer Infantry. This regiment distinguished itself for bravery and its commander, Colonel Boomer, was a conspicuous and valant leader in many memorable combats. Today his name occupies a position of high esteem in the hearts of the old soldiers, and to his memory there is accorded a reverence singularly profound and grateful. The local Grand Army of the Republic organization takes its name from him."

What is interesting here is that Kidd took his group to Benton Barracks where the unit eventually was rolled into the 5th Iowa Cavalry as Co M. see http://www.scriptoriumnovum.com/c/p/kidd.html

FWIW
John R