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Mâchicoulis de la Tour de Guise ( Château de Tours )
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Un mâchicoulis est une galerie formant un encorbellement, soit en position mitoyenne ou en couronnement d'une enceinte militaire (tour, courtine, rempart, etc.) et dont le plancher ajouré permettait, si besoin, de lancer divers projectiles au pied du mur, zone souvent vulnérable.
Ce système de défense active en maçonnerie, surtout sous la forme de « mâchicoulis sur consoles » se répand à la fin du Moyen Âge (deuxième moitié du xive siècle) en remplacement de celui des hourds en bois.
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