The 9th Army Group began moving into Korea on November 5th. Part of the 9th Army Group, the four divisions of the 20th Army crossed from Manpojin to Yudam-ni and covered the routes across the mountains leading to the west. At Yudam-ni the 89th Division were to hold the road against the Marines attack to the west. The 59th Division would cut the road south of Yudam-ni and hold the Toktong pass. The 58th Division would attack from the southwest and over-run the town. The 60th Division would cut the road between Hagaru-ri and Koto-ri and over-run Koto-ri.

In September 1952 the 23rd CCF Army replaced the 20th CCF Army and they rotated the 20th CCF Army back to China.