Known by the Germans as "Fest Wagner" built 1904-1910 in German-occupied Lorraine. It was to protect Germany from the French Army trying to retake the Lorraine. It was built with 8 turrets, 4 with 10cm guns and 4 with 15cm guns, as well as a rail system designed to facilitate moving guns from covered positions to firing points.
If your French is good, here is a web page on the fort:
http://www.ac-nancy-metz.fr/ia57/crm...ny/default.htm
And a Wiki article, also in French:
http://fr.wikipedia.org/wiki/Groupe_...A9_l'Aisne
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