Bumtsend made his first contact with Mongolian revolutionaries in 1920 while working for the administration of his local hoshuu.

He helped collect winter clothing for the partisan army and was involved in propaganda work.

After Mongolian partisans and Soviet Red Army troops successfully entered Khüree in July of that year, Bumtsend's unit participated in several mop up guerrilla operations against remnants Baron Roman von Ungern-Sternberg's forces.

He joined the Mongolian People's Revolutionary Party in 1923 and spent much of the 1920s working as a police chief while strengthening the administrative structures of the revolution in his home district.

It was an honorary role, with power residing in the hands of the prime minister, Khorloogiin Choibalsan.