Lin Zheng, a hero who fought against U. S. Aggression and aided Korea, was reborn in 1937 after his death and became a Chinese liaison officer trained by the Far East Secret Line. When gunshots rang out at the Marco Polo Bridge, he turned back and received covert aid from abroad, recruited Chinese workers, recruited expatriates, and formed mountainous tribesmen in British Burma to form the Chinese Anti-Japanese Volunteer Army. When the Songhu War broke out, he returned home and joined the Anti-Japanese War from western Yunnan, turning a lone army into a national iron army.