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Asked by kimbery from USA | Feb. 13, 2014 11:33

About:China Great Wall

what were the towers along the great wall used for

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Answered by Nelson from USA | Feb. 19, 2014 00:28

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They were built to transfer messages. If the enemies attack at daytime, the soldiers start the smoke. If they come at night, they start fire. With the help of smoke and fire, the army commanders know the enemies come. Then they can prepare for the fights.

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