At Montsurs, take the road to Sainte-Suzanne and, at the Basses-Poteries Calvary, take the Chemin de Jugeard (a small road); after about 100 metres, you can park at the entrance to a track.
(S/E) Return to the D9 and continue south-east along it to reach the junction with a footpath after Les Hautes Poteries.
(1) Turn right onto this path to enter the forest. You will reach the hamlet of Haute Folie.
(2) Continue in the same direction to reach a wide lane marked by a small mound of earth at the entrance.
(3) Turn left onto it and continue straight down to the D9.
(4) Take this road on the left for about 200 m and turn right onto the first track. Continue until you reach a stony track. Follow it to the left, until you reach the Croix du Prussien.
(5) Turn left, heading due west, and continue straight on until you reach the D9 and the Basses Poteries car park (S/E)