Walton Walker
On 13 November, Mao appointed Zhou Enlai the overall commander and coordinator of the war effort, with Peng as field commander. On 25 November on the Korean western front, the PVA 13th Army Group attacked and overran the ROK II Corps at the Battle of the Ch'ongch'on River, and then inflicted heavy losses on the US 2nd Infantry Division on the UN forces' right flank. Believing that they could not hold against the PVA the Eighth Army began to retreat from North Korea crossing the 38th Parallel in mid-December. UN morale hit rock bottom when Lieutenant General Walton Walker, commander of the US Eighth Army, was killed on 23 December 1950 in an automobile accident.