ORDER OF BATTLE // December 31, 1950
Third Battle of Seoul
Estimated force strength by side, with confidence labels per surviving record.
Forces engaged
2 sides catalogued · combined 306,525 estimated
United Nations
136,525
Medium-confidence figure
China
170,000
Medium-confidence figure
Battle context
The Third Battle of Seoul, fought from December 31, 1950, to January 7, 1951, represented a major Chinese offensive against the South Korean capital and is also known as the Chinese New Year's Offensive, the January–Fourth Retreat, or the Third Phase Campaign Western Sector. The engagement involved a United Nations force of approximately 136,525 against a Chinese force of roughly 170,000, with Chinese casualties recorded at 5,800. The battle's alternate designation as the 'January–Fourth Retreat' indicates a significant UN withdrawal during the fighting, consistent with the broader pattern of the war's mobile, contested phase in late 1950 and early 1951 when Chinese intervention had fundamentally altered the strategic balance on the peninsula.
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