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Vieux Bastion
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Rempart Bellevue de Senlis ( Oise ).
Le bastion est un ouvrage en fortification bastionnée qui fait partie de l’enceinte du corps d’une place ou des remparts d'une ville, présentant en saillie deux faces et deux flancs. Il est relié à l’enceinte par ces derniers. Il remplace, dans les fortifications classiques, la tour pour fournir les feux de flanquement sur la courtine et défendre les angles du corps de place.
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