Start from Col du Calvaire. Park on the right-hand side of the road when coming from Orbey, or on the left-hand side when coming from Col du Bonhomme or Col de la Schlucht.
Yellow ring markings
(S/E) Take the wide flat path heading east towards the Duchesne Cemetery and the Tête des Faux (signs, numerous markers of different colours). Pass under the high-voltage power lines and head north-east into the forest, staying on the main path and ignoring the side paths and perpendicular paths.
(1) At the Ferme des Immerlins, continue along the main path and ignore any side paths. The path gradually curves northwards and, at the crossroads with an information sign for the Massif des Faux leaning against a rock, take the path that climbs up to the left. You will soon reach the Duchesne Cemetery.
Signposting: Yellow ring + red rectangle
(2) Facing the information sign, go left (signposts on a tree) and turn right at the corner of the stele dedicated to Alpine hunters. At the fork that immediately appears, take the left-hand path. This path, paved with large stones, climbs between the trees to reach a flat area. After a slight descent, note the remains of old trenches on the right. Climb again until you reach a junction with a path leading off to the left (this will be the way back).
(3) Continue straight ahead and ignore a wide path branching off to the right (cross-country ski trail in winter). Climb steeply, winding your way up, passing the remains of shelters (beams, sheet metal), go around a memorial on the right and reach the summit (high cross perched on a base of beams).
(4) Descend by the same route, pass the cross-country ski trail (on your left this time) and return to the fork.
Signposting: Yellow ring + red-white-red rectangle
(3) Turn right onto the grassy path (signposted "Retour Col du Calvaire"). After about 100 metres, turn left onto a narrow path (be careful to spot this start, as there is no sign to indicate it in advance and there is a marker further along the path). Descend steeply, then follow a few switchbacks. You will come out onto a wide path, which you follow to the left towards Le Bonhomme (sign).
Markings: Yellow ring (+ green ring at the start)
(5) At the T-junction, turn left and continue on relatively flat ground. Stay on the main path, which quickly turns south-southwest. After a slight descent, at a fork, take the left-hand path. Immediately cross a perpendicular path and continue south-west to a large crossroads in open terrain (information sign leaning against a rock).
Markings: Yellow ring + red rectangle
(6) Continue straight ahead on a slight incline into the forest. Head south-west, then west and south-west again, staying on the main path and ignoring any side paths. Pass under a ski lift line and cross a wide grassy strip (ski slope). Leave the Tinfronce Refuge on your right and climb uphill. Pass under the high-voltage power lines again and return to the car park where you started (S/E).

very pleasant little loop, as described and in line with our expectations. Rating: 5/5