| These vaulted casemates form the main walls of the fort and support the wide gundeck, the roof of the Castillo. |
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| Belfort was fortified by the military architect Vauban, who created an elaborate system of towers, casemates, curtains and counterscarps. |
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| There are 142 ouvrages, 352 casemates, 78 shelters, 17 observatories and around 5,000 blockhouses in the Maginot Line. |
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| The mines employed were controlled mines, anchored to the bottoms of the harbors and detonated under control from large mine casemates on shore. |
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| The design of the casemates is similar to the ones found in the southern part of the Maginot Line and photographs of them are often confused with Maginot forts. |
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