On May 12, 1939, the Soviet army fought a fierce battle in the Normandy area near the Halychin River, named after the Halychin River attack on May 12, 1939, the Soviet army frequently fought the border between northeast China and Mongolia. On May 12, 1939, the Soviet army directed the "Mongolian Army" to invade the Mongolian People's Republic near the Halychin River, provoking the Normandy incident. On July 1, the 23rd Division and 130 aircraft entered the border with Mongolia. On May 23, the Army attacked and defeated the Normandy. On August 12, 1939, the Commander of the Mongolian Army commanded the Soviet Army, and the Commander of the Soviet Union commanded the Soviet Army in the east, in exchange for tan