The Tieling post in the northern border was besieged by the enemy for seven days. Company commander Cheng Jianchuan and less than forty remaining soldiers defended the snow line. When they were running out of ammunition and food, reconnaissance squad leader Jiang Ye discovered that the enemy was surrounded but not attacking, only to cover a secret passage into the hinterland of the country. Firepower reconnaissance officer Xu Ningshuang mastered the key coordinates, but instructor Han Xiao discovered that the rescue telegram had been tampered with. Cheng Jianchuan decided to give up his defense and lead his team to penetrate behind enemy lines: they wanted to bring the wounded home, and they also wanted to dig out the traitors and conspiracies hiding in the shadows on the border.
