In July, the 57th became part of the Transbaikal District's newly formed 17th Army. On 1 November, it fielded 11,957 men with 19 anti-aircraft machine guns, seventy-one 45 mm guns, thirty-four 76 mm guns, twenty-four 122 mm guns, twelve 152 mm guns, two BT tanks, five T-26 tanks, nine other tanks, and 753 trucks, among other equipment. Following the beginning of Operation Barbarossa, the German invasion of the Soviet Union, on 22 June 1941, the division remained with the 17th Army in Mongolia. It sent reinforcements to the front during the war. Samarsky was sent to the Eastern Front to become chief of staff of a field army in February 1942. He was replaced by the chief of the 17th Army cadre department, Colonel Ivan Khokhlov. Colonel Viktor Nikiforov (promoted to Major General 16 October 1943) took command of the division in July 1943, after Khokhlov was sent to study at the Higher Military Academy. In September, the 57th was subordinated to the newly formed 85th Rifle Corps of the army. Nikiforov was promoted to command the corps in April 1944, and was replaced by division deputy commander Lieutenant Colonel Nurey Zakirov, who was promoted to Colonel on 10 August 1944. For the Soviet invasion of Manchuria, the division became part of the newly arrived 6th Guards Tank Army on 17 July 1945. The 127th Regiment handed over its border positions in the Khamar-Daba area to troops from the 39th Army on 19 July and camped on the eastern outskirts of Tamsagbulag. Three companies from the regiment were detached to protect airfields. On 21 July, it was subordinated to the commander of the army's 9th Guards Mechanized Corps. During this period, the division conducted training and was brought up to full readiness in weapons, ammunition, equipment, and vehicles. Officers surveyed the jumping off positions for the attack, while the division's units were alerted for combat. On 28 July, the corps ordered the division to move to new positions near wells northeast of Lake Khala-Gaita-nur. At 15:00 on 28 July the division began the march via two routes and by 8:00 on 30 July had reached the new positions. There, the 1st and 2nd Separate Tank Battalions with BT-7 light tanks were operationally subordinated to the division.