UN forces invaded Attack North Korea in October 1950 and moved Motion rapidly towards the Yalu River—the border with China—but on 19 October 1950 , Chinese forces of the People 's Volunteer Army ( PVA ) crossed Motion_directional the Yalu and entered Arriving the war Hostile_encounter .

UN forces invaded Attack North Korea in October 1950 and moved Motion rapidly towards the Yalu River—the border with China—but on 19 October 1950 , Chinese forces of the People 's Volunteer Army ( PVA ) crossed Motion_directional the Yalu and entered Arriving the war Hostile_encounter .

The offensive Attack reversed Change the United Nations Command ( UN ) advance towards the Yalu River which had occurred Presence after their intervention in the wake of the North Korean invasion of South Korea at the start of the war .

The Battle Hostile_encounter of Chongju ( 29–30 October 1950 ) took place Process_start during the United Nations Command ( UN ) offensive Attack towards the Yalu River , which followed Motion the North Korean invasion Attack of South Korea at the start Process_start of the Korean War Military_operation .

Liao gave Giving Goryeo permission to incorporate Cause_to_amalgamate the land between the border of Liao and that of Goryeo , which was occupied Control by Jurchen tribes that were troublesome to Liao , up to the Yalu River .