 In the aftermath of the Battle of Onjong , the Chinese recognized the ROK II Corps as the most vulnerable unit of the Eighth Army . Besides lacking the firepower of their US counterpart , the ROK II Corps also held the most difficult terrain on the UN right flank . At 10 a.m. on November 24 , the ROK 7th Infantry Division on the II Corps ' left flank attacked north from Tokchon . At the same time , the ROK 8th Infantry Division on the II Corps ' right flank advanced north from Yongwon . The stubborn defenses by the PVA 38th and 42nd Corps soon ground the Korean advances to a halt , and the continuous fighting for the next two days failed to create any gains for the Koreans . During the advances , the Chinese defenses managed to create a wedge in the center of the ROK 7th Infantry Division , forcing the division to commit most of its reserves on the front line . Meanwhile , the ROK 6th Infantry Division in the II Corps ' rear could only offer its 2nd Infantry Regiment as the corps ' reserve due to the earlier losses at Onjong . 
