Headquarters: World War II - Ardennes is downloadable content for the turn-based strategy game Headquarters: World War II. This add-on expands the game with two new campaigns, one German and one US, comprising 16 total encounters focused on the Battle of the Bulge in December 1944. It introduces 12 new unit models, including advanced US and UK tanks, and incorporates new winter environments, weather, and terrain types. The narrative follows both the German offensive and the Allied counterattack, allowing players to command troops from both perspectives.