The collective monograph of Russian and Mongolian scientists examines the issues of Russian-Mongolian military cooperation during the Great Patriotic War and the participation of the MPR in the final stage of World War II. The study, based on the documents of the Central Archive of the Ministry of Defense of Mongolia and the collection "On the Front" in old Mongolian writing, first introduced into scientific circulation, reveals the issues of material assistance and moral support of the Mongolian workers of the Red Army and the Soviet state, as well as the assistance of the USSR in training command personnel for the MNRA.monography is intended for specialists in the field of military history and history of Mongolia of the twentieth century.