On 18 of June of 1861, Robert Minter joined a military company of "South-Rights" men called the "Mounted Rangers" which met every Wednesday evening at the Armory in the Thompson House. The company was under the command of H. L. Routt.
http://www.ouramazingancestors.us/minter_robert-h/robert_h_minter.html

See also:

http://www.libertytribune.com/opinion/article_f3f1b7d2-ce99-5a94-9c89-f7e0239f6802.html