Warships (which featured on the Jagex website) was a remake of Battle Cruisers (which featured on Games Domain). Its gameplay was based upon the popular game battle ships. It featured on the Jagex site in and around 2004. Interestingly enough it is the only game to have not been remade on FunOrb or RuneScape, it is possible that Jagex are planning to remake it pretty soon as they did promise the return of all multiplayer games.
When it featured on the Jagex website in 2004 its description read:
Attempt to sink all your opponents ships