Desc: Shuang xia: Directed by Cheh Chang. With David Da-Wei Chiang, Lung Ti, Feng Ku, Lei Cheng. A prince of the Sung Dynasty has been taken prisoner by Ching invaders and is being held in an impenetrable fortress by elite men of the Ching. A group of fighters loyal to the Sung set out on a treacherous journey to the fortress in order to free the prince. A mysterious stranger is recruited to accompany the fighters to help them gain access to the fortress.