I've always told my friends that gladiators faught "sea battles" as well as the more commonly thought of man-to-man/beast combat, but not many believed me. I have given up on them, but I would like to know much more on this type of once-in-a-lifetime event. I'm especially interested in the naumachia thrown by Claudius around AD 52, which from what I've seen from different sources, had somewhere around 19,000 gladiators fighting on triremes and quadremes, though I can't remember where it was held.