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:

And a Wiki article, also in French:'Aisne

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