In a surprise raid on the communist People’s Republic of China (PRC), military forces of the Nationalist Chinese government on Taiwan invade the mainland and capture the town of Sungmen. Because the United States supported the attack, it resulted in even deeper tensions and animosities between the U.S. and the PRC.

In October 1949, the leader of the communist revolution in China, Mao Zedong, declared victory against the Nationalist government of China and formally established the People’s Republic of China. Nationalist troops, politicians, and supporters fled the country and many ended up on Taiwan, an island off the Chinese coast. Once there, they declared themselves the real Chinese government and were immediately recognized as such by the United States. Officials from the United States refused to have anything to do with the PRC government and adamantly refused to grant it diplomatic recognition.

Nationalist Chinese leader Chiang Kai-Shek bombarded the mainland with propaganda broadcasts and pamphlets dropped from aircraft signaling his intention of invading the PRC and removing what he referred to as the “Soviet aggressors.” In the weeks preceding the March raid, Chiang had been particularly vocal, charging that the Soviets were supplying the PRC with military advisors and an imposing arsenal of weapons. On March 15, thousands of Nationalist troops, supported by air and sea units, attacked the coast of the PRC, capturing the town of Sungmen that lay about 200 miles south of Shanghai. The Nationalists reported that they killed over 2,500 communist troops. Battles between the raiding group and communist forces continued for weeks, but eventually the Nationalist forces were defeated and driven back to Taiwan.

Perhaps more important than the military encounter was the war of words between the United States and the PRC. Communist officials immediately charged that the United States was behind the raid, and even suggested that American pilots and advisors accompanied the attackers. (No evidence has surfaced to support those charges.) American officials were cautiously supportive of the Nationalist attack, though what they hoped it would accomplish beyond minor irritation to the PRC remains unknown. Just eight months later, military forces from the PRC and the United States met on the battlefield in Korea. Despite suggestions from some officials, including the commander of U.S. troops Gen. Douglas MacArthur, that the United States “unleash” the Nationalist armies against mainland China, President Harry S. Truman refrained from this action, fearing that it would escalate into World War III.