November 1950. Allied forces under General MacArthur have driven North Korean forces clear across the peninsular, to the point that the Allies are about to reach the Yalu River, Korea's border with China. In the vanguard of these forces is the US 1st Marine Division, camped around the Chosin Reservoir in preparation to renew the attack. Then, on 27 November, China entered the war through a surprise attack on Allied forces. The 1st Marine Division was soon facing overwhelming odds and was in danger of being entirely wiped out.
—grantss