 During the chaos of the battle , Major General Yu Jai Hung of the ROK II Corps did not receive news from the front line until midnight of November 25 — five hours after the Chinese had entered the Korean rear . Responding to the crisis , Hung committed the ROK 2nd Infantry Regiment of the 6th Infantry Division to block the Chinese divisions . As the 2nd Infantry Regiment marched towards the front on the morning of November 26 , the PVA 113th Division intercepted the regiment and destroyed its command post , scattering the ROK II Corps ' entire reserve in the process . With most the ROK II Corps ' units destroyed by November 27 , the UN right flank had fallen to the Chinese . 
