The Battle Hostile_encounter of Pakchon ( 5 November 1950 ) , also known as the Battle Hostile_encounter of Bochuan ( ) , took place Process_start ten days after the start Process_start of the Chinese First Phase Offensive , following the entry Process_start of the Chinese People 's Volunteer Army ( PVA ) into the Korean War .

Yet by late November the US Eighth Army was again forced Motion to withdraw Escaping after the PVA began Process_start their Second Phase Offensive , starting Process_start a long retreat Escaping south .

In response Response to the successful Chinese First Phase Campaign Military_operation against the United Nations ( UN ) forces , General Douglas MacArthur launched Process_start the Home-by-Christmas Offensive Attack to expel Removing the Chinese forces from Korea and to end Process_end the war Military_operation .

Anticipating this reaction , the Chinese People 's Volunteer Army ( PVA ) Commander Peng Dehuai planned Arranging a counteroffensive Attack , dubbed Name_conferral the `` Second Phase Campaign '' , against the advancing UN forces .

Hoping to repeat the success of the earlier First Phase Campaign Military_operation , the PVA 13th Army first launched Process_start a series of surprise attacks Attack along the Ch'ongch'on River Valley on the night of November 25 , 1950 at the western half of the Second Phase Campaign Military_operation ( ) , effectively destroying Destroying the Eighth United States Army 's right flank while allowing Preventing_or_letting PVA forces to move Self_motion rapidly into UN rear areas .

Hoping to repeat the success of the earlier First Phase Campaign Military_operation , the PVA 13th Army first launched Process_start a series of surprise attacks Attack along the Ch'ongch'on River Valley on the night of November 25 , 1950 at the western half of the Second Phase Campaign Military_operation ( ) , effectively destroying Destroying the Eighth United States Army 's right flank while allowing Preventing_or_letting PVA forces to move Self_motion rapidly into UN rear areas .

The First and Second Battles of Wonju ( ) , also known as the Wonju Campaign or the Third Phase Campaign Eastern Sector ( ) , was a series of engagements between North Korean and United Nations ( UN ) forces during the Korean War .

The Third Battle of Seoul , also known as the Chinese New Year 's Offensive , the January–Fourth Retreat ( ) or the Third Phase Campaign Western Sector ( ) , was a battle Hostile_encounter of the Korean War , which took place from December 31 , 1950 , to January 7 , 1951 , around the South Korean capital of Seoul .

Official Chinese sources refer to this battle Military_operation as the eastern part of the Second Phase Campaign Military_operation ( or Offensive Military_operation ) ( ) .

The western half of the Second Phase Campaign Military_operation resulted in Causation a Chinese victory in the Battle Military_operation of the Ch'ongch'on River .