This movie released in 1967 starts with a mission of assassination ordered by the prominent eunuch Cao Ji of the Ming Dynasty to kill the offspring of Yu Cian, the ex-minister of the Department of War, who was put to death on trumped up charges fabricated by Cao Ji. Cao was worried about the potential rivalry of the Yu family, so he ordered the head of Dongchang, Cao Shaocin (played by Bai Ying) to kill Yu's sons and daughter (played by Hsu Feng), who were sentenced to serve in the defense force at a frontier bridgehead, Longmen because of their father. Cao Shaocin sent Pi Shaotang (played by Miao Tian), the first vice chief, and Mao Zongsian (played by Han Yingchie), the second vice chief, to carry out this mission by killing the victims half way along to the frontier.

      Yu's ex-subordinates Jhu Ji (played by Syuan Han) and Jhu Hui (played by Shangguan Lingfong), and a righteous swordsman Siao Shaozih (played by Shih Chun) secretly escorted the Yu family youngsters. The decisive battle occurred at the Dragon Inn and the Yu family was rescued.

      This movie is well plotted without any loose ends. Every movement leads to the final battle location, the Dragon Inn. The main actors and actresses, such as Shangguan Lingfong, Shih Chun, Bai Ying and Hsu Feng were all newly recruited. Because of its excellent martial arts choreography and the carefully restored Ming costuming, this movie successfully entered the international film market including Japan, South Korea, the Philippines and Europe. It attended the International Film Festival in Berlin in 1968; it also won the best screenplay in the Golden Horse Film Festival in Taiwan, ROC in 1968. And it was the top grossing movie in Taipei in 1967.