The Korean peninsula was split into two countries after the Second World War. The Soviet backed North and the U.S. backed South. North Korea tried to unify the two by invading South Korea in June 1950. Initially North Korea had great success. It pushed South Korea's small military aside and rushed down the peninsula while the United States tried to get forces onto the peninsula. The North Koreans were finally stopped around the port of Pusan at the very bottom of...