A free app for Android, by War Action Fun Studios.

MEDIEVAL NAVAL WARS: FREE REAL-TIME STRATEGY GAME is an action-packed adventure game that puts you in control of a powerful naval army. You will lead your fleet to victory in epic sea battles. 

You will have to fight against many other players, all of whom will be controlling their own fleets. Each player will be assigned a territory, and you will be able to deploy your fleet to attack and defend your territory.

The goal is to become the leader of the seas. You will be able to command a variety of ships, from light combat ships to massive battleships and even aircraft carriers. The ships will have different capabilities, such as firepower, defense, and mobility.

You will be able to use the different ships in different ways. For example, you can use a light combat ship to attack and destroy your enemies. Or you can use a huge battleship to defend your territory against attacks.