Political map of Russia & the former Soviet Union 8 June 1921 (Von Sternberg in Mongolia): While the Soviets battled the Green movement (Left-wing uprisings against the Bolsheviks), White remnants (White movement) were still at large in the east. One of the last major White generals was Baron Ungern von Sternberg (Ungern von Sternberg), who invaded Mongolia with his Asian Cavalry Army.