At the conclusion of the Inchon-Seoul campaign, the entire 1st Marine Division embarked on Navy ships and sailed around South Korea, landing at Wonsan in October. The division then marched 70 miles north to the Chosin Reservoir area. As the Marines arrived at Chosin Reservoir, the Chinese Communist military encircled the entire division and the coldest winter in 50 years descended on Korea. Temperatures fell as low as −35 °F as a blizzard swept the area.