Mongolian Revolution of 1921: The Mongolian People's Army defeats local Chinese forces at Altanbulag, Selenge (then known as Maimachen). This battle w...

Mongolian Revolution of 1921: The Mongolian People's Army defeats local Chinese forces at Altanbulag, Selenge (then known as Maimachen). This battle was seen as the birthday of the People's Army and completed the expulsion of Chinese militants in Mongolia.