The firing plan of the fortress Kornwerderzand - may 1940
The first line shows the majority of casemates. The thicker dotted lines show the firing-windows of the 5 cm guns, the thin dotted lines show the machinegun positions. From this it is obvious that some casemates were only designated to defend the position if an enemy had successfully penetrated the first line. Also defences against coastal landings have been prepared. It is important to know that the machineguns placed in the casemates could be taken out and placed in prepared field positions were they would have a much wider firing window.
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