The occupation of Outer Mongolia (also known as the Chinese invasion of Mongolia) by the Beiyang government of the Republic of China after the revocation of Outer Mongolian autonomy (Chinese: 外蒙古撤治) began in October 1919 and lasted until 18 March 1921, when Chinese troops in Urga were routed by Baron Roman von Ungern-Sternberg's White Russian (Buryats, Russians etc.) and Mongolian forces. These, in turn, were defeated by the Red Army and its Mongolian allies by June 1921.
The occupation of Outer Mongolia (also known as the Chinese invasion of Mongolia) by the Beiyang government of the Republic of China after the revocation of Outer Mongolian autonomy (Chinese: 外蒙古撤治) began in October 1919 and lasted until 18 March 1921, when Chinese troops in Urga were routed by Baron Roman von Ungern-Sternberg's White Russian (Buryats, Russians etc.) and Mongolian forces. These, in turn, were defeated by the Red Army and its Mongolian allies by June 1921.
Source: Wikipedia "Occupation of Mongolia" · CC BY-SA 4.0
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