Cold War Files: All Units: Events: Intervention of Chinese Communist Forces (CCF)

The CCF intervention against U.S. X Corps in northeast North Korea was neither as massive nor as successful as its offensive against EUSA. The most intense combat in the X Corps sector occurred in the vicinity of the Chosin Reservoir. There, following the ROK 3d Division's unsuccessful attempt to clear the area of the CCF, the U.S. 1st Marine Division waged a stubborn six-day battle from Nov. 2 to Nov. 7. Negotiating steep zigzag roads and precipitous slopes in frigid weather to reach the Koto-ri plateau and the reservoir, the Marines dislodged the CCF and dug in.