This French blockhouse, Quarouble, is a so-called Poste de Tir. The entrance was a few meters from such a blockhouse and access to the shooting room was via a short tunnel. One kilometer further away is the Réservoir d'Onnaing blockhouse. In the middle of the field is the Poste de Tir Réservoir d'Onnaing with its access at 20m.
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