Potosi's Post - Credit: Wikimedia Commons
Potosi's post, in eastern Linn County, Kansas, was established at the small town of Potosi, Kansas, founded in 1857 by those loyal to the southern cause in Kansas. The other side, the free-staters, soon gained control of the town and it was loyal to the Union when the Civil War broke out in 1861. Potosi was located along the north bank of Mine Creek and it was along the military road running from Fort Leavenworth to Fort Gibson. At its height the town had thirty residents, a store and a post office. William G. Cutler, History of the State of Kansas (Chicago: A. T. Andreas, 1883), pp. 1106-7, 1116. Read more on Wikipedia
Source: en.wikipedia.org