On 12 May 1793 the department expanded itself with the Bailiwick of Liège, Couvin, and the countships from the Holy Roman Empire of Fagnolle and on 26 October 1795 a part of the Duchy of Bouillon.
After the victory of the allies in the Battle of Waterloo on 18 June 1815, the second Treaty of Paris subtracted territory from Ardennes to attach to the Netherlands: Duchy of Bouillon, Couvin, Mariembourg, Fagnolle, and Philippeville.