From the publisher website: Introducing our new WWI system, this is a stand alone game, allowing you to game small unit WWI actions. Rules include infantry, cavalry, artillery, vehicles, plus barbed wire, trench crossing, gas, and more. Troop lists are very flexible, allowing you to decide what you need to fight. Players of DH/C7B will be familiar with some mechanics, but you do not need DH/C7B to play.