[Kristoffer O]

Creativity!

Find new and unexpected ways to use the spells and items. If your opponent has encyclopedic knowledge this is harder, and if you have it it is easier.

Find unexpected ways to move strategically.

If your enemy expects what you will do you will only win if he is considerably weaker then you.


But creativity will only win you an even war. On a grander scale you must use diplomacy to fight a combined enemy force not stronger than your own, unless you can surprise and defeat some armies to even out the odds.