Barrage Vauban
... that the principal defensive function of the Barrage Vauban in Strasbourg was to enable the flooding of all the lands south of the city, making them impassable to the enemy?
... that the principal defensive function of the <b id="mwBEc"><a href="./Barrage_Vauban" id="mwBEg" rel="mw:WikiLink" title="Barrage Vauban">Barrage Vauban</a></b> in <a href="./Strasbourg" id="mwBEk" rel="mw:WikiLink" title="Strasbourg">Strasbourg</a> was to enable the flooding of all the lands south of the city, making them impassable to the enemy?