This may be peripheral to the question submitted by the original poster, but this thread reminds me of an article I saw a while back, in the Journal of Maritime Archaeology.
In 1817, a US Army boat with military personnel and their families was attacked by Indians while going up the Appalachicola River in northwest Florida. The battle which ensued precipitated the first Seminole War. The actual site was found by divers, I think in the 1990's, and was later named "the Flintlock Site." Subsequent professional archaeological excavation yielded a trove of artifacts, one of which was a lock plate clearly marked TVLLE.
The Indians in this conflict were on the riverbank, so we deduce the lock plate fell out of the boat. There isn't much we can say for sure, but this at least suggests the possibility of a French gun (or gun part) in the hands of white folks in Florida in 1817.
Best regards,
Notchy Bob