What role did the 7th Marines play during the movement from Yudam-ni to Hagaru-ri?

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During the movement from Yudam-ni to Hagaru-ri, which began on December 1, the 7th Marines played a critical role by moving through the hills to break up Chinese "fire sacks" and relieve the defenders at Tōktong Pass. While the 5th Marines protected the vehicle train along the road, the 7th Marines' efforts in the surrounding terrain were essential to the division's successful withdrawal. Their arrival at Hagaru-ri, alongside the 5th Marines, ensured that the airfield remained secure from Chinese fire, allowing for the delivery of vital supplies and the evacuation of thousands of casualties.1