 Gameplay-wise, the major difference between "Epic" and "Aeronautica Imperialis" is that instead of a player moving and firing tanks and troops, they are using aircraft and ground defense weapons.The "Aeronautica Imperialis" rulebook contains not only rules for the games, but also two sheets of cards which are used to make special manoeuvres.Other content in the rulebook is background material on the individual aircraft, along with full colour plates and suggestions for painting.