Michelsberg did not see significant action in the Battle of France until June 1940, when it was attacked from the rear by German forces that had bypassed the Maginot Line.

[7] It does possess an electrified 60 cm internal rail network, used to move supplies and munitions within the ouvrage.

[16] In addition to the connected combat blocks, a series of detached casemates and infantry shelters surround Michelsberg, including The manning of the ouvrage in June 1940 comprised 472 men and 19 officers of the 164th Fortress Infantry Regiment and the 153rd Position Artillery Regiment, commanded by Commandant Pelletier.

[7] The Casernement de Férange provided peacetime above-ground barracks and support services to Michelsberg and other positions in the area.

The ouvrage repulsed a full German attack on 22 June 1940, with help from Mont des Welches and Hackenberg.

[24] German forces did attempt to blow up the position when they evacuated, detonating explosives in the main gallery.

[25] Following World War II, interest revived in the use of the Maginot Line to defend against a possible Soviet advance through southern Germany.

By 1956, Michelsberg had been designated part of the Mòle de Boulay, a strongpoint in the northeastern defenses against Soviet attack.