Mao's Communist forces had won the Chinese Civil War in 1949. Freed from fighting the Chinese Nationalist Army, many experienced Chinese soldiers volunteered - or were ordered - to join the Chinese Communist Forces army to defend their fellows in North Korea. China did not use the People's Liberation Army, because it did not want to formally declare war on the United States and the UN.
Oct. 27, 1950- China enters war, bringing new Russian armaments
Nov. 1, 1950- China's First Phase Offensive, UN pushed south to Chongchon River
Nov. 21, 1950- U.S. 17th Regiment advances to Yalu River
Nov. 25, 1950- UN offensive launches from Chongchon River area
Nov. 27-30, 1950- Battle of the Chosin Reservoir
Dec. 14, 1950- UN resolution calling for a cease fire passes
Dec. 23, 1950- Gen. Walker killed in jeep accident, Gen. Ridgway takes command
Jan. 1-15, 1951- 500,000 N.K. and CCF troops recapture Seoul
Jan. 25, 1951- UN counterattacks in Ridgway Offensive
Feb. 1, 1951- Battle of Twin Tunnels, U.S. and French kill 1,300 Chinese troops