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Which United Nations unit faced the main Chinese attack at the Chosin Reservoir?

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Battle of the Chosin Reservior — Battle of the Chosin Reservoir Men and armor of the U.S. 1st Marine Division during the Battle of the Chosin Reservoir, North Korea, December 1950.

The Battle of the Chosin Reservoir was directed primarily against the 1st Marine Division of the U.S. X Corps.1

While the 1st Marine Division bore the brunt of the campaign, other units were also involved in the area. For instance, Task Force MacLean—a regimental combat team from the 7th Infantry Division—replaced Marines east of the reservoir on November 25, 1950. Additionally, a battalion of the 3rd Infantry Division later assisted in defending the final perimeter at Hŭngnam.23

The campaign was part of the Chinese Second Offensive, which aimed to drive United Nations forces out of North Korea. Despite the intense pressure and severe winter conditions, the 1st Marine Division successfully executed a retrograde movement to the coast, rendering several Chinese divisions ineffective in the process.13