Watch 123Movies. This film examines the reasons why the United States decided to engage in the Korean War. Scenes describe Russia's attempt to gain power following World War II (Korea included), and its refusal to allow free elections in the country. Footage shows Soviet-backed North Korean troops' movement into South Korea on June 25, 1950, the United Nations' response, and the armed struggle against both North Korean and later Chinese troops led by General Douglas MacArthur. Preserved by the Academy Film Archive in partnership with Twentieth Century Fox Film Corporation in 2005.