thanks for your posting!!!!
Maybe Ed was referring to "tinclads" rather than "gunboats" perhaps...????? I notice that the USS Diana is not usually referred to as a tinclad (does not appear in the usual listing of numbered tinclads #1-63), but usually as a gunboat?
Then again, maybe he was referring to a tinclad being captured in Mississippi...????
I dunno.....wish a confirmed image of the Petrel would materialize one of these days......[sigh]...
Ken