Feng Yuxiang
Feng Yuxiang, also known as the Christian General, sided with and betrayed just about every participants in the Chinese Civil War (earning him his other alias, the Defector General). Originally a soldier in the Beiyang Army under Yuan Shikai, he became one of the major warlord figures of the 1920s. In 1924 his army seized Beijing and banished Emperor Puyi from Forbidden Palace. He subsequently became involved in a war with Zhang Zoulin. He sided with the Kuomintang during the Northern Expedition but subsequently betrayed it and fought the Central Plains War alongside Yan Xishan. For a while he led an anti-Japanese rebel army in Inner Mongolia, then sided again with the Kuomintang during the World War. He died in a fire while crossing the Black Sea in 1948, on the way back to China from the United States via the Soviet Union.
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