military service for men of ages 18 to 40. To service the massive draft, the Bolsheviks formed regional Military commissariats (voenkomats), which still carry out this function in Russia. They should not be confused with military political commissars. Democratic election of officers was also abolished by decree, while separate quarters for officers, special forms of address, saluting, and higher pay were all reinstated. After General Aleksei Brusilov offered the Bolsheviks his professional services in 1920, they decided to permit the conscription of former officers of the Imperial Russian Army. The Bolshevik authorities set up a special commission under the chair of Lev Glezarov (Лев Маркович Глезаров), and by August 1920 had drafted about 315,000 ex-officers. Most often they held the position of military advisor (voyenspets: "военспец" an abbreviation of "военный специалист", i.e., "military specialist"). A number of prominent Soviet Army commanders had previously served as Imperial Russian generals. In fact, a number of former Imperial military men, notably a member of the Supreme Military Council, Mikhail Bonch-Bruevich, had joined the Bolsheviks earlier. The Bolshevik authorities assigned to every unit of the Red Army a political commissar, or politruk, who had the authority to override unit commanders' decisions if they ran counter to the principles of the Communist Party of the Soviet Union. Although this sometimes resulted in inefficient command, the Party leadership considered political control over the military necessary, as the Army relied more and more on experienced officers from the pre-revolutionary Tsarist period. Civil War Polish–Soviet War The Polish–Soviet War represented the first foreign campaign of the Red Army. The Soviet counter-offensive following the 1920 Polish invasion of Ukraine at first met with success, but Polish forces halted it at the disastrous (for the Soviets) Battle of Warsaw (1920). Far East In 1934, Mongolia and the USSR, recognising the threat from the mounting Japanese military presence in Manchuria and Inner Mongolia, agreed to co-operate in the field of defence. On March 12, 1936, the co-operation increased with the ten-year Mongolian-Soviet Treaty of Friendship, which included a mutual defence protocol. In May 1939, a Mongolian cavalry unit clashed with Manchukuoan cavalry in the disputed territory east of the Halha River (also known in Russian as Халхин-Гол, Halhin Gol). There followed a clash with a Japanese detachment, which drove the Mongolians over the river. The Soviet troops quartered there in accordance with the mutual defence protocol intervened and obliterated the detachment.