1946, when ruthless bandits occupied Northeastern China and threatened the lives of civilians there. The most powerful bandit of all was Mountain Eagle, with an impenetrable fortress up in Tiger Mountain and armed with strong artillery. Unit 203 of the Liberation Army, led by Shao, was crossing the Northeastern region when they encountered Eagle's men raiding a village. Shao decided to stay and fight against Eagle. Headquarters sent a skilled investigator Yang, who infiltrated Eagle's gang as an undercover. The duo was soon engaged in a battle of wits with the cold-blooded Eagle, deep inside the snowy forest.