Park on the square near the church in Gauchin-Légal.
(S/E) Turn left at Chaussée Brunehaut (D 341) into Rue Bocquet. Follow it to the right, then turn left into Chemin d'Héripré. Cross the Ruisseau de Caucourt and reach a T-junction (château on the right). Turn left, then immediately right into Rue Petite (tough climb). Reach a T-junction.
(1) Turn right onto the small road and continue for 1km.
(2) At the crossroads, turn right into a hairpin bend to reach Gué de Caucourt and its beautiful mill. Cross over and continue on the minor road. Ignore the 1st street on your right (Rue du Parc), and take the 2nd street (Rue Guédin just before the church) to join the D73.
(3) Take the D73 on the left for a few metres and continue straight ahead into Rue de Magnicourt. The tarmac disappears and you follow a beautiful arched path to a T-junction.
(4) Turn left, then immediately right on the rising path. This is a very nice path, but can be difficult in wet weather. A good kilometer further on, you'll find a rustic staircase and a hiking post on the right.
Continue straight ahead on a recently restored (but poorly maintained) path, reaching a crossroads.
Turn right onto the grassy path.
After approx. 500m, spot the track on the left.
(6) Follow this path for about 500m to reach a hedge.
(7) Then turn right onto the path and join a wide track between two wind turbines.
(8) Turn left and reach a fork in the road.
(9) Turn left to join the D72.
(10) Follow this road for 150 m to the right, then turn right onto a grassy, very slippery path to reach a crossroads.
(11) Turn left and immediately right, still on the footpath. At the first houses in Hermin, turn right onto Rue Basse.
(12) Follow it to the left (pretty pond on the left) and reach a T-junction.
(13) Turn right (you're now on the GR®127 which will take you back to Gauchin). Shortly after the calvary, turn left onto a surfaced track and reach the D3. Follow it to the left towards the church (S/E).