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China's Great Wall was never breached but a general opened a gate and let the Mongol army through. So, a wall is only as good as those given the task of protecting it.
It failed to protect reigning dynasties from usurpers, though; e.g. the Manchu were north of the Wall, and they successfully conquered despite it. I can't find if there was treachery involved in those instances as with the successful Mongol invasion.
The Manchu were north of the Wall, and they successfully conquered despite it.

































