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As long as weapons remained relatively primitive, permanent fortifications predominated. The art of fortification developed in earliest times with the building of earthworks made up of layers of mud, sticks, rocks, and the like. These soon were developed into walls, then into palisades and elaborate wooden stockades. In the Middle East walled cities appeared very early. Those of Mesopotamia had walls of mud or sun-dried brick built to withstand invaders. The citadel, a fort or fortified section within the city, also appeared early. Phoenician cities were strongly walled and offered sturdy resistance to Assyrian, Persian, and Macedonian attackers. Major developments in permanent fortification were made by the Romans, who constructed walls along the Danube and Rhine and in England (e.g., Hadrian's Wall ). Some of these had elaborate systems of watchtowers, with provisions for garrisoning men along the walls. In E Asia the famous Great Wall of China was an even more ambitious undertaking of the same type.
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