The word for siege or siegecraft in Greek was poliorkia (hence the term “poliorcetics,” or “fencing in the polis”). Although there was an advanced science of taking cities by 431 involving rams, mounds, and fire weapons, walls themselves remained mostly unassailable, as they grew taller and thicker well beyond the old dimensions of ten to twelve feet in height and three to six feet wide, common before the mid-fifth century. The spread of ashlar blocks and regular courses of limestone, replacing mud bricks, rubble, and irregularly shaped stones, throughout the war widened the advantages of
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