[Agema]

Also, be warned units that are not amphibious will take sizeable combat negatives underwater when (if) you get them there: -3Att -3Def as I recall, and an AP penalty so they'll be pretty slow. Plan your army accordingly, as you'll need a stronger army than to take out roughly equivalent land forces.

Make sure - in MP at least - that if attacking someone else you have adequate defences (good MR, guarding troops, chaff leaders) for your commander as well. If they are killed they take their waterbreathing item with them and your troops will drown.