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THE GREAT WALL OF CHINA by Miles Hilger Signal Towers Signal towers were used to send military communications. Military communications : fires, lanterns, smoke signals, raising banners, beating clappers, or firing guns. Signal towers often built on hilltops for maximum visibility were self contained high platforms or towers. The lower levels contained rooms where soldiers would sleep, stables for animals, sheep folds, and storage areas. Cool fact There is a myth that you can see the great wall of china from space, but actually you would need 17,000 times better vision to see it. Meng Tian As general under Shihuangdi, the first emperor of the Quin dynasty, was sent to subdue the nomadic central Asian tribesmen. Other Chinese rulers were said to have built defensive walls in the north, before this time , Meng probably incorporated these lesser walls into his work.