Which Chinese force was sent to destroy the 1st Marine Division at the Chosin Reservoir?

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The Chinese force sent to destroy the 1st Marine Division at the Chosin Reservoir was the Ninth Army Group, commanded by General Song Shilun.1

This force consisted of 12 divisions organized into three armies, totaling approximately 150,000 soldiers. While the Chinese aimed to isolate and destroy the 1st Marine Division, the Marines successfully fought their way to the coast at Hŭngnam, rendering several Chinese divisions ineffective in the process.123