Noun | 1. | Ardennes - a wooded plateau in the Champagne-Ardenne region of France; the site of intense fighting in World War I and World War II Ardennes counteroffensive, Battle of the Ardennes Bulge, Battle of the Bulge - a battle during World War II; in December 1944 von Rundstedt launched a powerful counteroffensive in the forest at Ardennes and caught the Allies by surprise Champagne-Ardenne, Champagne - a region of northeastern France |