Rule modifications and naval lists designed for the simple but satisfying resolution of fleet sized naval battles. Although these rules are grounded on the existing naval aspects of DBM, they are in no way intended as a replacement for the existing rule mechanics used in the land game. Instead the aim has been to create a set of rules appropriate for purely naval battles. The rules and naval lists have been written with a very specific period in mind, namely 240BC to 167BC. This is the period from the end of the First Punic War to the final Roman destruction of the Macedonian monarchy. But the rules might be accommodated with further modifications right through the 15th century and beyond. —description from the introduction (extracted)