On 14 May, Lt. Col. Yaozo Azuma led the reconnaissance regiment of 23rd Infantry Division, supported by the 64th Infantry Regiment of the same division, under Colonel Takemitsu Yamagata, into the territory and the Mongolians withdrew. Soviet and Mongolian troops returned to the disputed region, however, and Azuma's force again moved to evict them. This time things turned out differently, as the Soviet–Mongolian forces surrounded Azuma's force on 28 May and destroyed it. The Azuma force suffered eight officers and 97 men killed and one officer and 33 men wounded, for 63% total casualties. The commander of the Soviet forces and the Far East Front was Comandarm Grigory Shtern from May 1938.