"Border Army in the Late Ming Dynasty: Iron Guards Guarding the Pass": Shen Li was the commander-in-chief of the Shanhaiguan border army, and Dorgon of the Qing Dynasty led the Eight Banners Army to attack the pass. There were surrendered generals in the Ming army who collaborated with the enemy and secretly opened the water gate on the west side. After Shen Li found out, he led 300 soldiers to guard Shuimen and bombarded the Qing army with red cannons until reinforcements arrived, holding the key line of defense at Shanhaiguan.
