 Although the UN aerial reconnaissance observed on November 27 that the Chinese forces on the UN right flank were moving rapidly into the Eighth Army 's rear , Walker still ordered the rest of the Eighth Army to continue the offensive north . Convinced that the collapse of the ROK II Corps was merely a small counterattack by the Chinese , Walker ordered the US I and IX Corps to shift eastward in order to cover the ROK II Corps ' sector . By that time , however , the US I and IX Corps had already suffered heavy losses from the Chinese counteroffensive at Kujang @-@ dong , Ipsok and Yongsan @-@ dong . 
