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Chinese Han Dynasty (206 BCE-220 CE)

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Han Great Wall. Map of the wall showing watch towers.
2nd c BCE Chinese Han Document

CHINESE MODERN Anonymous (c. 1900 - present)
c. 140 BCE-120 BCE
2nd c BCE
Yumenguan Pass. Gansu. China.
The wall was integrated with watch towers and military garrisons for soldiers created a continuous system within line of sight. Mirrors and signal fires were used for communications. The soldiers of the garrisons grew their own food and were self-supporting.

Caption: CHINESE MODERN Anonymous|Map of the wall showing watch towers. |Han||Chinese| Yumenguan Pass. Gansu. China. |©Kathleen Cohen
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