Pretty straight forward mission. Build 2 shipyards and 2 ships to set over all your soldiers. Take care that the shipyards get the iron they need quickly and make the rest of the iron into sword fighters. Manage your food the way that only gold and coal mines are getting food. Build up 1 or 2 additional gold smelter for more fighting strength. Once all soldiers are on the enemy island attack. Do it like shown so you can intercept a lot of soldiers (best on your own area) then split up for all towers and take them at fast as you can.