Found this on the web:
In June 1821 a Cherokee war party led by the half-blooded chief Walter Webber struck the Chouteau trading post on the Grand River. Their justification was that the manager of the post, Joseph Revoir, had been supplying the Osage with guns and ammunition. Revoir was murdered and his scalp taken back to the Cherokee village where it was used as the centerpiece of a Fourth of July celebration.
Found at these two websites:
http://www.forttours.com/pages/stchoute.htm
http://www.ok-history.mus.ok.us/mus-sites/masnum33.htm