The Battle of Chosin Reservoir was a significant conflict during the Korean War, occurring from late November to mid-December 1950. U.S. Marines, along with other United Nations forces, faced a surprise attack from the People's Liberation Army of China in the harsh winter conditions of North Korea. Despite being heavily outnumbered, the Marines fought bravely and managed to conduct a fighting withdrawal. The battle is notable for the extreme cold, with temperatures dropping as low as -35°F (-37°C). The U.S. forces, although encircled, successfully retreated to the port of Hungnam, where they were evacuated. The battle highlighted the challenges of winter warfare and the resilience of the troops involved.