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The earliest defensive border walls date from the Eastern Zhou Dynasty (770-256 BC) and featured deep trenches to stop charging Mongol horses.
Author: Michael Yamashita
©Michael Yamashita
Photo size: 4.2 Mpixels (12.1 MB uncompressed) - 2509x1682 pixels (8.4x5.6 in / 21.2x14.2 cm at 300 ppi)
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