 To ensure the success of the Chinese counterattack against ROK II Corps , the PVA 40th Corps was assigned the mission of protecting the PVA 38th Corps ' flank against the US 2nd Infantry Division . To accomplish this mission , the PVA 119th Division of the 40th Corps would first attack Somin @-@ dong and to prevent the Americans from reinforcing the Koreans . The 120th Division would then fight its way across the Ch 'ongch 'on River and tie down the bulk of the US 2nd Infantry Division . Finally , the 118th Division would flank the Americans from the west and capture Kujang @-@ dong from the rear . 
