[Ironhawk]

Whatever map you are on doesnt really matter after a certain point as the tactics are pretty much all the same. Once you know how to handle the AI you should be able to do it anywhere. In your case, the best advice is the old adage: the best way to win a two front war is not to get in one.

-Keep your PD high on all AI or potential AI borders.
-Keep your troop numbers at #2 or #3 rank.
-When you do declare war on an AI (or they do on you) go straight for the throat! Take thier capital and crush thier production capacity and then mop up the rest of thier provs.

If you do find yourself in a two front war (as i agree is often the case vs. AI) the best things to do are to just get to the chokepoints and fortify them. Place good sized garrisons there and just let the AI impale itself trying to attack you every 5-10 turns there. It doesnt know any better. Keep the defensive posture until you are finished with your primary opponent. Only then come back and wipe out the secondary.

One other note about fighting the AI. Try to keep the size of your front to as few provinces as possible (like 2-3 if you can do it!). This will keep the AI from randomly breaking out and wandering around aimlessly in your backcountry. Use lulls in the fighting after big battles to capture territory and move the front forward thru wide areas (where you might need to defend 5+ front provs) and back to a more managable size.