The Fort of Aubin-Neufchâteau was built in April 1935 and inaugurated on 9 May 1937. From 10 May 1940, it offered resistance to the German army. After 23 infantry, air and artillery attacks, the garrison of 545 men only surrendered on 21 May 1940 due to a lack of ammunition and after most of the artillery pieces had become inoperable due to overuse. In 1942, the fort became a testing ground for German secret weapons, including the “Röchling grenade”, a two-metre-long rocket that could penetrate a thirty-metre layer of earth and concrete. The terrible damage can still be seen today! The underground tour (thirty metres deep) takes in the subterranean rooms and battle stations, as well as the troop quarters hit by the “Röchling grenades”. A new museum located about 500m from Fort Aubin and inaugurated in 2021 takes visitors back to 1940 through documents, objects, mannequins and dioramas, giving them a better understanding of what was happening in Aubin-Neufchâteau at the time.