The Allies expansion set is an expansion for the base-game History of War. It uses the same game mechanics but introduces new units into HoW. As always there is a solid mixture of base improvements, territory improvements, units and action cards. The Allies Expansion Set may not be played stand-alone. From the back of the box: (including typos) For the first time in card game history, fans of both card an strategy games will be able to experience a phenomenal and stunning new gaming experience. Units that you are likely to encounter: Spitfires, p-38 Lightning, B-17's, German Ju-87 Stukas and Heinkel HE-111 bombers. Thanks like the well known Sherman and the deadly Tiger. Also the naval power does not stay behind and will be represented by powerful units like the German Super Battleship Tirpitz and the powerful British Dreadnoughts, while next to them invisible submarines roam the wide deep Atlantic trade routes... Card mix: (55 cards) 14 x land units 15 x air units 11 x naval units 5 x action cards 3 x territory improvement 5 x base improvement 2 x territory