Better watch it, Steve, you're walking on real thin ice with this "never captured" thing. Are you sure you want to cast Jonathan Carter as a traitor and a turncoat, turning a Confederate gunboat over to the Yankees? Please, at least give the man the credit for having the last river gunboat to be surrendered to the Yankees.

And, too, if you stick with your original proposition, you're going to be in the awkward position of having to define the difference between 'captured', 'surrendered' and 'released'.