A few shots of a rifled cannon used to block Union traffic from using the Mississippi river:
https://www.milsurps.com/images/impo...inpdpgxs-1.jpg
https://www.milsurps.com/images/impo...rg0icsbr-1.jpg
https://www.milsurps.com/images/impo...dpeujk9r-1.jpg
https://www.milsurps.com/images/impo...c1hljsou-1.jpg
https://www.milsurps.com/images/impo...qvq26ntd-1.jpg
https://www.milsurps.com/images/impo...lf9kepcn-1.jpg
Mind you, river vessels can run a big larger these days!
Also visited the remains of Grant's Canal, which was a failed attempt to avoid having to run the Confederate blockade.