Relatively easy but long descent (not recommended for children). Numerous views from the summit.
Start from Les Gondrans (top of Montgenèvre ski lift) or climb up the forest road from Montgenèvre (D+ 600m). From the top of the Col des Gondrans, follow the old military road on the south-facing slope,
as far as Fort d'Anjou. Then switch to the Briançon side, passing the Fort du Randouillet and the Fort des Trois Têtes.
Take the track down to the Asfeld bridge
climb back up to the Cité Vauban, and cross it to reach the Champ de Mars.
Very easy