The only time for the volunteers: how did the volunteers wipe out more than 3,000 American elite infantry regiments in Changjin Lake?

The only time for the volunteers: how did the volunteers wipe out more than 3,000 American elite infantry regiments in Changjin Lake?
The movie Changjin Lake mentions a very famous Xinxingli Battle during the Changjin Lake Battle.

The

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the movie "Changjin Lake" mentions a very famous Xinxingli Battle during the Changjin Lake Battle. In the Xinxingli Battle, the 27th Army of the Chinese people's volunteers won a brilliant victory in wiping out more than 3100 combat units of the US elite infantry regiment through bloody battles. this was the first and only record of the volunteers wiping out the combat units of the US infantry regiment during the War to resist US aggression and Aid Korea. So how did the volunteers win the brilliant victory of wiping out more than 3100 members of the US elite infantry regiment in Changjin Lake?