In the movie "First Blood", veteran Rambo returned to his country from Vietnam. When he was back in the small town he came from, he felt that the place was foreign to him. Ever since the local police chief set his eyes on Rambo, the policeman had made things endlessly difficult for him. The chief had even brought Rambo back to the police station and humiliated him.
As he was unable to endure the brutality, Rambo struck back and then escaped. The chief gathered numerous police officers and the National Guard Soldiers to launch a search and arrest Rambo. Meanwhile, Rambo had escaped into the deserted woods and dealt with the soldiers using the military knowledge that he had picked up in Vietnam.
At that time, his war instincts had been awakened. In the small town, there was no person, law or weapon that would be able to stop him.