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In Fryslân stonden dergelijk blokhuizen in Franeker, Harlingen, Leeuwarden en Stavoren. 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In tijden van oor-logsgevaar bemand met een relatief kleine bezetting en vrijwel nooit als permanente legerplaats. Schansen bewaakten en verdedigden strategische doorgangsroutes in moeilijk toegankelijk terrein en die soms opzettelijk onder water werden gezet (inundatiesysteem). 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