Duel of Eagles is a medium-complexity wargame on the Battle of Mars-la-Tour, in the Franco-Prussian War. This battle is notable for having one of the last successful cavalry assaults in modern warfare. This is a chit-pull game. The chits are either Activation Chits, which activate all units within the indicated corps, or Event Chits, which each contain two possible events which the player can chose between. Each turn both players draw from the chit cup until all chits have been used or there are no remaining HQ's on the map. The game requires the players to maintain supply lines, both to rally units that are shaken or low on ammo and to achieve the victory conditions. The victory conditions for the French player are to maintain the routes to Metz and Verdun. The Prussian player must try to prevent this from happening.