With the start of the Soviet invasion of Manchuria 9 August 1945, the Red Army immediately pierced in the sector of "135th division", manned by 15th border guards group at Hutou. The 15th border guards group was assigned to "135th division" at the beginning of the battle. Nonetheless, because of the more threatening Soviet breakthrough at Suifenhe, two infantry battalions were detached from the "135th division" 9 August 1945 and were reassigned to the 124th division. The "135th division", catch off-guard, with majority of officers attending a war game at Yangming District was ordered to withdraw to Yangming District in the evening 10 August 1945. 15 August 1945 it was ordered to retreat further to Mudanjiang, and finally order to surrender was received 17 August 1945 as the part of the surrender of Japan.