Re: Shuidonggou area
Inside the tunnel are many rooms such a prison;meeting room; training room and wells. In times of war, comes in handy.
According to Sun Tzu Art of Warfare, surprise is a key element. As the enemy shoud not have been aware of this secret installation, they would be ambushed I think and if the Ming soldiers were surrounded, they would be able to escape and call for help via the tunnel.
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