The Battle of Pakchon (5 November 1950), also known as the Battle of Bochuan (Chinese: 博川战斗; pinyin: Bó Chuān Zhàn Dòu), took place ten days after the start of the Chinese First Phase Offensive, following the entry of the People's Volunteer Army into the Korean War. The offensive reversed the United Nations (UN) advance towards the Yalu River which had occurred after their intervention in the wake of the North Korean invasion of South Korea at the start of the war.