Military advisors from Russia played an important role in creation and development of the Mongolian Army. The first military advisers in Mongolia were the commanders of 5th Army, which fought in the civil war from the Volga up to Lake Baikal in the Russian Civil War: It Liyatte, Litvinstev, Kosich, Sorkin, Sheko, Pokus, Kangelari. They helped in creation of the Mongolian Army, which had defeated the army of Baron Ungern. Military advisors and instructors in Mongolia became especially active after 1925, when Red Army units were removed from Mongolia. At this time here especially appreciable were L. Vainer, K. Rokossovsky, V. Sudets, V. Gordov, K. Zimin. They helped to transform the Mongolian Army into a modern mechanized force. According to the Protocol on mutual aid between USSR and Mongolia in March 1936 the Red Army again entered Mongolia, the new groups of advisers and instructors included: I. Pliev, M. Tikhonov, V. Panyukov, I. Nikitin etc. Due to their activity the power of the Mongolian Army has increased which in 1939 together with Red Army successfully acted against the Japanese armies in the Nomonhan (Khalkin-Gol) frontier war