Passionate about the architecture and history of the Middle Ages, Eugène Viollet-le-Duc not only restored magnificent castles and monuments, such as Notre-Dame-de-Paris, the castle of Pierrefonds, the city of Carcassonne, etc., but also left numerous writings.The work we offer here is a true history book. Well-written, beautifully illustrated, historically well-documented and with numerous historical notes, this Essay on military architecture will satisfy the amateurs of the genre.