The popularity of naval battles was rather short-lived. It was fun for a while, but not many events could keep up interest in it. Fighting on boats both took a while to win (which wasn't much fun for the people that died early), and it was overall just a kind of limited type of battle. In the end, it was the same ships on the same maps, with clumsy captains piloting their ships somewhat at random. It died out after a while, and I can't say I know of any events that do them anymore. There are marine regiments out there, but they still function as normal line infantry.