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Cascading protection
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Because of the relief that surrounds it and well before Montalembert, Briançon has deployed a belt of fortifications covering each other. Fort des Têtes hence protects Briançon, Fort du Randouillet, and Fort Dauphin, while Fort du Randouillet watches over Fort des Têtes and Fort d'Anjou. Fort d'Anjou protects Fort Dauphin and the southern slope of the Infernet, and Fort Dauphin defends Fort des Têtes and the southern ridges of the Infernet.
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