On October 25,1950, Chinese forces started a fight with the South Koreans less than 40 miles South of the Yalu River. Within less than a week Chinese MiGs had appeared along the Yalu. The sunday after Thanksgivng 1950, the Chinese struck with 300,000 men, which made up 33 divisions. To the south of the Chosin REsevoir more than 120,000 chinese surrounded and attacked 15,00 United Nations Troops. The U.N.