Fort Dirks Admiraal was originally built by the French between 1811 and 1813. The Dutch modernised it from 1880 to 1890. During the German occupation (1940-1945), it was transformed into an anti aircraft battery, armed with four 10,5 cm S.K. C/32 gun pieces. The RAF launched several attacks on the fort.
The Germans have four bunkers, FL243 built on the four L401 bunkers in 1943.
Between the four bunkers were built the bunker FL244, with a rangefinder with two observation posts. The rangefinder could calculate the distance to the flying object, after which the four 10.5 guns could take action.
These four bunkers, FL243 and the FL244 are still present at Fort Dirks Admiral.
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