Xu Shuzheng
Mongolia and Tuva became contested territories. After being occupied by Chinese General Xu Shuzheng in 1919 and then by the Russian White general turned independent warlord, Ungern von Sternberg, in 1920, Soviet troops, with the support of Mongolian guerrillas, led by Damdin Sükhbaatar, defeated the White warlord and established a new pro-Soviet Mongolian client state. By 1924, it had become the Mongolian People's Republic.