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My good friend mr G.Postma pointed me to the existence of a small fortress, near the town of Coevorden, built in 1672 as a reaction to the Munster Invasion.
It seems to be a small fortress, never used in combat but more as a border post. According to the dutch wiki, it was first marked on a map in 1681.
Now it is partially restored and a Rijksmonument.
More info here, on the website of the council of Coevorden, in dutch. The picture above is lend to me by Google Earth.
