The 120 mm turret of the fort. The guns had a range of 14,5 km and had to fire at the bridges across the river Meuse. The turret was inpenetrable for the German hollow charges. However the tubes were a weak point, so the German troops put explosive charges in them. The Germans have put concrete in the hole of the hollow charge to conceal it for a visit of officers of friendly countries. Even their allies weren't allowed to know of the existence of the hollow charges.