The monument
Constructed entirely to the plans of Vauban, encased in a ring vault with the remarkable inclusion of a wide ventilation shaft, surrounded several years later with a lower battery flanked by two guardrooms.

 

The casemate is covered by an ring vault on a central pilar.  The German army shared it into two floors during the Second World War. The two floors are now used for temporary and permanent exhibitions.
 


The Fort in 1803 (when Napoleon's army stayed in Boulogne) : The casemate was disarmed, partitionned and used as a munition storage. German did the same in 1940.
 
 
 
 
 
 

The Fort 1804 : The guns are only on two floors :  the big ones on the lower level and the others on the upper level.
 
 
 
 
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