Préfecture (capital): Cergy[?]
Sous-préfectures: Argenteuil[?], Montmorency[?] and Pontoise[?].
List of Communes of the Val-d'Oise département of France
... of them hid in the forested regions, especially in the unoccupied zone. They joined together to form maquis bands and began to plan attacks against the occupation forces. ...