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Trading Post is an unincorporated community in Linn County, Kansas, United States, which is said to be one of the oldest continuously occupied locations in the state. In 1842 a United States Army fort was built there, but it was soon abandoned. The fort remained until probably at least 1900. It was used by troops travelling through the during the American Civil War and a military post was established in 1861 and lasted until summer 1865. The Battle of Marais des Cygnes was fought here during the American Civil War. The location derives its name from a French trading post established there about 1825.
The site is also the location of the Marais des Cygnes massacre on May 19, 1858, when Charles Hamelton was forced out of the state by Jayhawkers returned with border ruffians from Missouri and captured 11 Jayhawkers where they were shot (five were killed, five were wounded and one escaped by feigning death). John Brown was to visit the site and built a fort.