Near the bridge across river the IJssel, there are 3 bridge casemates / river casemates. These casemates, called Zwolle North, Zwolle Middle en Zwolle South, were part of the IJssel line at the time of the German invasion in 1940.
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- Text: Eric vd Reek
- Photos: Arjan Vrieze (1,5), Eric vd Reek (2,3,4)