Timeline of United States military operations May 1949. 1948–1949: China: Marines were dispatched to Nanking to protect the American Embassy when the city fell to Communist troops, and to Shanghai to aid in the protection and evacuation of Americans. 1950–1953: Korean War: The United States responded to the North Korean invasion of South Korea by going to its assistance, pursuant to United Nations Security Council resolutions. US forces deployed in Korea exceeded 300,000 during the last year of the active conflict (1953). Over 36,600 US military were killed in action. 1950–1955: Formosa (Taiwan): In June 1950, at the beginning of the Korean War, President Truman ordered
United States Air Force In South Korea North Korean forces largely removed from the South, the United Nations decided to enforce its prewar intention of reuniting all of Korea under one government, and UN forces advanced across the 38th parallel and into North Korea in early October 1950. However, the decision to cross the 38th Parallel appears, in retrospect, to have been the turning point in the Korean War. On 1 October Chinese Premier Chou En-lai warned that China would not tolerate or stand aside if UN forces invaded North Korea. This was a clear threat that China would intervene if that should happen. On the second