Here’s an addendum to a post from back in August about the Gadsden cavalry guidon in the Charlton Heston movie “Major Dundee”.
Superfan GSR has had his own custom-made copy of the flag made up. Here it is in action:

GSR's Gadsden guidon
We’re still not sure if the flag was really flown by cavalry units, but now it’s really being flown by GSR.
