Fellow Belgian here, our ancestors had been naive...
Our main line of defense, the fort d'Ében-Émael, had been built by German workers. The German army had their plans, and knew the weak point of the fort: its vast, undefended roof (it was used as a football field by the soldiers).
During a dark night, they landed with gliders on the roof, and manually set up shaped charges[1] to destroy the turrets, which were resistant to conventional bombs.
Our main line of defense, the fort d'Ében-Émael, had been built by German workers. The German army had their plans, and knew the weak point of the fort: its vast, undefended roof (it was used as a football field by the soldiers).
During a dark night, they landed with gliders on the roof, and manually set up shaped charges[1] to destroy the turrets, which were resistant to conventional bombs.
Game over.
[1] http://en.wikipedia.org/wiki/Shaped_charge , damages seen from the outside: http://upload.wikimedia.org/wikipedia/commons/thumb/f/f6/Ebe...
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Edited to reconcile my foggy memory with the historic truth...