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Let's say sometime time during the early part of the tenth century AD , the Korean Kingdom of Goryeo builds the "Great Wall of Korea", a large wall that would stretch along the southern banks of the Yalu River and other parts of Northern Korea. If properly manned, how well could this wall do in keeping out the Mongols, Chinese, and any other invaders coming from the North?

Now that I think about it, why didn't the Koreans build a wall?
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