As a general, you must carefully deploy your forces across three possible theaters of war: air, land, and sea. If you can control two out of three of these theaters, you will win the current battle. But winning a single battle is not enough to win the game. And in fact, sometimes you may want to surrender and lose a battle on purpose in order to win the larger war.
The Revised Edition contains requests from fans of the game including new icons on the cards indicating the theatre, rulebook cleanup/clarifications and improved saturation of color.