The Hauts are all the infantry works as well as the mountain huts located in general on the axis of the St-Bernard.
These works were complements to the artillery works of Champex and Commeire: Château Roc (3 casemates with 2 machine guns each and an ammunition and troop shelter), Manoday (2 casemates equipped with a mine launcher, 1 observation post and 1 ammunition store), upper and lower Biolley (3 forts equipped with two machine guns and 2 forts with a fortress machine gun, Pont-Sec (two forts equipped with two machine guns and a fortress machine gun). The troops (machine gunners and mine launchers) were incorporated into the personnel of the fort they were defending and the commander (artillery captain) of these external defense works was the commander of the fortress company of Champex or Commeire. The soldiers would return to the main fort to sleep or eat.
Other works could also depend on Champex, such as Prayon East (4 fortress machine guns) and Prayon West (2 fortress machine guns), but the soldiers in these works left the Champex fort on the day of their engagement (with their weapons and baggage, as well as food) to stay at Prayon, where they could rest (dormitory for the troops and their cadres). These positions became the support points for the infantry in the sector. The men in these positions reported to the commander of the company defending the sector.
Other works, such as the Nid d’Aigle, the mined work under the fort, were served during an engagement by soldiers from the air force or engineering troops, who were assigned to the commander of the Champex fort for accommodation, lodging and organization.
To accommodate the troops stationed on the upper part of the St-Bernard system, in particular to avoid the passage of enemy troops on foot from the St-Bernard into the Val de Bagnes, or even into the Val Ferret, 21 huts were built between the valleys, at the following locations Monts-Teilliers (Col du St-Bernard, alpine pastures of La Pierre and Ars-Dessous), Six-Rodzes inferior (alpine pasture of Erra) and superior (alpine pasture of Erra), La Vouardetta (alpine pasture of Erra), La Chaudière (alpine pasture of Erra), Rogneux summit (alps of Mille and Erra), Signal du Rogneux (alps of Mille and Erra), Mont-Brûlé inférieur( alps of Mille and Erra), Mont-Brûlé supérieur (alps of Mille, Erra and des Arpalles), Plan de Mille (alpe de Mille), Tête de la Payanne (alpe de Mille, Six-Blanc) and col du Chargerat (Moay, Six-Blanc)
Half of these huts were acquired by the Pro Forteresse Association in 1996. They have been renovated and rented.