On this day in 1644 – Ming–Qing transition: Ming general Wu Sangui allowed the invading Manchu to cross the Great Wall of China(pictured), allowing them to capture Beijing and establish the Qing dynasty. 
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On this day in 1644 – Ming–Qing transition: Ming general Wu Sangui allowed the invading Manchu to cross the Great Wall of China(pictured), allowing them to capture Beijing and establish the Qing dynasty. 
