Fort Pannerden was constructed between 1869 and 1871 to serve as part of the New Dutch Waterline. Originally built completely out of brick and mortar, with just one main battery guarding the Rhine, it was upgraded significantly during 1885-1895. The main battery was completely rebuilt, with armour and concrete, while two additional armoured batteries were added and the roof of the fort was reinforced with concrete. The fort had strategic significance in that it guarded the Pannerden Canal, which supplied the water for the inundations of the New Dutch Waterline and could potentially be used as a route towards the main line of defence, but the fort saw little active service.
In World War I the Netherlands remained neutral, although the fort was manned as part of a general mobilisation. In World War II on May 10, 1940, during the German invasion of the Netherlands, the fort was first bypassed and then surrounded. On May 11, cut off from the rest of the Dutch army, the commander of the fort surrendered under threat of artillery bombardment and air attack. Most of the fort was subsequently stripped of all useful materials and after 1945 the building fell into disuse.
References:The Château de Foix dominates the town of Foix. An important tourist site, it is known as a centre of the Cathars. Built on an older 7th-century fortification, the castle is known from 987. In 1002, it was mentioned in the will of Roger I, Count of Carcassonne, who bequeathed the fortress to his youngest child, Bernard. In effect, the family ruling over the region were installed here which allowed them to control access to the upper Ariège valley and to keep surveillance from this strategic point over the lower land, protected behind impregnable walls.
In 1034, the castle became capital of the County of Foix and played a decisive role in medieval military history. During the two following centuries, the castle was home to Counts with shining personalities who became the soul of the Occitan resistance during the crusade against the Albigensians.