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In the Middle Ages, when raids and petty warfare were customary, the typical fortifications were town walls of masonry, great citadels within the cities, and castles . The Crusades helped further the development of fortifications. Similar structures were used in the chaotic warfare of feudal China, India, and Japan. In the West many castles and citadels, notably those of the Moors in Spain, were defensible against all but a long siege.
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