Bois du Four fortification

Fort A5 Bois du Four. Source :

This fortification is built on 3 levels, including a short passageway 30 metres underground. It was capable of housing 137 men.


Bois du Four fortification has a reinforced concrete roof 3.5 metres thick.

Initial plans by the Commission for the Organisation of Fortified Regions (CORF) described an artillery fortification with five combat blocks and separate entrances for men and ammunition. The blockhouse was built between 1931 and 1932. The finished building has 3 levels: the top floor, the bottom floor and a short passageway 30 metres underground. It was capable of housing 137 men. It was armed with, firstly, an eclipse turret with twin Reibel machine guns and three GFM cloches with rifle-machine-gunners and, secondly, with five crenels equipped with twin Reibels, three of which are switchable and a 47mm anti-tank cannon, six crenels with rifle-machine-gunners and two 81cm mortars under a bunker. A cloche completes the observation post.




Bois du Four fortification

Located between Longwy and Metz (N52/A30) take the Morfontaine/zone industrielle exit and follow signs towards Morfontaine.

Tel: +33 (0)3 82 26 12 10



Guided tours between 2pm and 5pm on the first Sundays in May, June, July, August and September.

Groups by appointment only.


Entrance: Adults €2, children under 12 €1.


Fortweb website on European fortifications


Website on the Maginot line

  • Chambre de tir mortiers de 81
    ©Association Ouvrage A5 Bois du Four
  • Cuisine
    ©Association Ouvrage A5 Bois du Four
  • Chambre de tir ouest
    ©Association Ouvrage A5 Bois du Four
  • L'usine
    ©Association Ouvrage A5 Bois du Four
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    Practical information


    03 82 26 12 10


    Adultes : 2 € Enfants jusqu'à 12 ans : 1 €

    Weekly opening hours

    Le premier dimanche des mois de mai, juin, juillet, août et septembre de 14 à 17 heures. Uniquement sur rendez-vous pour les groupes