However, as a result of the Russian Civil War, the White Russian Lieutenant General Baron Ungern led his troops into Mongolia in October 1920, defeating the Chinese forces in Niislel Khüree (Ulaanbaatar) in early February 1921 with supports by Mongols.
Leta 1919, po oktobrski revoluciji v Rusiji, so Kitajski vojaki pod vodstvom Xu Shuzhenga zasedli Mongolijo.