When the Duke was put down by Baron Klaus Wulfenbach, the von Zinzers tried to walk the gunboat to Paris. Unfortunately, they met a Wulfenbach patrol (led by Bangladesh DuPree) while crossing a section of wasteland. In her typical style, Bang didn't even give the gun-boat a chance to surrender before she attacked it. Only a few individuals, including Moloch and Omar, managed to escape the flaming wreckage.
The Vienna 707 was armed with several cannons, although whether these were death ray weapons or conventional projectile artillery has yet to be determined. It had a figurehead.