The Soviet 35th rifle division (103rd, 104th, 105th brigades, 35th cavalry regiment) and Shchetinkin's Special Expeditionary Detachment of Red Partisans (mounted) were in the Baikal region. The border of the Far Eastern Republic (FER) with Mongolia was guarded by units of the People's Revolutionary Army of the FER - the 2nd Separate "Sretenskaya" cavalry brigade, as well as a border battalion and a guard company.
In addition, in the border Mongolian city of Maimachen, Red Mongolian units under the command of Sukhe-Bator were grouped. The total number of troops concentrated against Ungern reached 7,500 bayonets and 1,950 sabers with 250 machine guns and 28 guns.
Later, the 5th Cavalry Division joined the Reds, and the 7th Special Detachment, the 232nd and 234th Rifle Regiments from the 26th Rifle Division were also sent from the 5th Red Banner Army.
By the beginning of the performance, Ungern had a superiority of 1,300 people in terms of manpower, but was inferior in the number of machine guns by more than 6 times and in artillery by 7 guns.