Question: Which battle happened first, Battle of the Ch'ongch'on River or  Battle of Stones River?
Sentence (from "Battle of Wawon"): After the collapse of the US Eighth Army's right flank during the Battle of the Ch'ongch'on River, the Chinese 38th Corps advanced rapidly towards the critical road junction at Kunu-ri in an effort to cut off United Nations forces' retreat route.
Relevant evidence: No