Under the aegis of the [[United Nations]], nations allied with the United States intervened on behalf of South Korea. After rapid advances in a South Korean counterattack, North-allied Chinese forces intervened on behalf of North Korea, shifting the balance of the war and ultimately leading to an armistice that approximately restored the original boundaries between North and South Korea. | Under the aegis of the [[United Nations]], nations allied with the United States intervened on behalf of South Korea. After rapid advances in a South Korean counterattack, North-allied Chinese forces intervened on behalf of North Korea, shifting the balance of the war and ultimately leading to an armistice that approximately restored the original boundaries between North and South Korea. |