This casemate was part of the Grebbe-line (het Werk bij Krachtwijk). In this defense-line there were two different types of casemates with the name "Porcupine": Type S3A was armed with a light M20 Lewis machinegun and had three firing positions. Type SZW was armed with a heavy machinegun and had three firing positions. Both types had a crew of three soldiers. The casemates were build in 1939.
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- Text: Fedor de Vries
- Photos: Paul Wareman