Chinese Communists cross the North Korean border just as United Nations troops were moving to finish off the North Korean forces. The Chinese forces cut off U.S. troops near the Changjin reservoir. The U.S. forces march successfully to Hungnam on the coast where they could be evacuated. Elsewhere U.N. forces are forced back until a U.N. counter-attack stops the Chinese advances an recaptures Seoul. Truman dismisses MacArthur after the General pushes to attack mainland China.