This supplement expanded the Second Edition of the rules to account for wargamming the 14th and 15th century battles. The rules adapted troop types and reaction tables for the medieval armies. The rule were design for use in the 1970 Wargames National Championships. Note: The title on the cover of the supplement is "Adaptation f Ancient Rules to 14/15th Century Warfare" while the title in the header on the interior of the rules is "Adaption of Ancient Rules to 14/15th Century Warfare."