Battles of Khalkhin Gol
The river Khalkhin Gol cuts through a disputed strip of land where the borders of Manchukuo and Mongolia meet. In 1939, this remote area became the stage for a violent clash between two empires. Japan had occupied Manchuria in 1931 and turned its military gaze toward Soviet territories nearby. The Soviet Union signed a Mutual Assistance Pact with Mongolia in March 1936 to allow troop deployments there. That same year, Japan countered by signing the Anti-Comintern Pact. Following the full invasion of China in July 1937, the Soviets sent the 57th Special Corps led by Ivan Konev to defend the border.
Tensions escalated when Genrikh Lyushkov, a Soviet NKVD major general who knew Stalin personally, defected to Japan on the 13th of June 1938. He carried secret documents that allegedly revealed the dire situation of the Soviet army in the Far East. The first major incident occurred at Lake Khasan in 1938, but clashes continued frequently along the border. By May 1939, the principal occupying force in Manchukuo was the Kwantung Army, which acted largely autonomously from Tokyo. The western region was garrisoned by the 23rd Infantry Division under General Michitarō Komatsubara. This division was the newest and least experienced unit in the entire Kwantung Army, rated as having below-medium combat capability.
Battles began on the 11th of May 1939 when a Mongolian cavalry unit of some 70 to 90 men entered the disputed area searching for grazing land. Manchu cavalry attacked them and drove them back across the river Khalkhin Gol. On the 13th of May, the Mongolians returned in greater numbers, but the Manchukoans failed to dislodge them. Lt. Col. Yaozo Azuma led the reconnaissance regiment of the 23rd Infantry Division into the territory on the 14th of May. Soviet and Mongolian troops surrounded Azuma's force on the 28th of May and destroyed it completely.
Azuma's force suffered eight officers and 97 men killed plus one officer and 33 men wounded, totaling 63 percent casualties. Both sides increased their forces throughout June. On the 5th of June, Comcor Georgy Zhukov arrived with more motorized and armored forces. He brought Comcor Yakov Smushkevich with his aviation unit. Zhamyangiyn Lhagvasuren was appointed Zhukov's deputy as Corps Commissar of the Mongolian People's Revolutionary Army. The Japanese Army Air Force struck the Soviet airbase at Tamsak-Bulak on the 27th of June, winning that engagement without Tokyo's permission. Tokyo promptly ordered no further air strikes against Soviet bases to prevent escalation.
The Japanese planned a two-pronged assault involving three regiments plus part of a fourth advancing across the Khalkhin Gol. They aimed to destroy Soviet forces on Baintsagan Hill before turning south toward the Kawatama Bridge. The second prong fell to the IJA 1st Tank Corps under Lieutenant General Yasuoka Masaomi. This force included Type 89 I-Go medium tanks, Type 97 Chi-Ha medium tanks, Type 94 tankettes, and Type 95 Ha-Go light tanks. The northern task force crossed the river but was forced to withdraw after Zhukov launched a counterattack with 450 tanks and armored cars.
Soviet armor consisted primarily of BT tanks with some T-26s, while armored cars were BA-10s and BA-3/6s. Despite lacking infantry support, the Soviet armored force attacked from three sides and nearly encircled the Japanese. The Japanese had only one pontoon bridge for supplies, which severely hampered their logistics. Meanwhile, the southern task force attacked on the night of the 2nd of July in darkness to avoid Soviet artillery. A pitched battle ensued where the Yasuoka Detachment lost over half its armor yet still could not break through Soviet lines. By early July, the Japanese had only 600 trucks rising to 1,000 by month's end, with only 75 percent operable.
Japanese military records reported approximately 20,000 battle and non-battle casualties along with 162 aircraft lost in combat and 42 tanks disabled. Roughly 500 to 600 Japanese and Manchus were taken prisoner, though most were listed as killed in action due to doctrine prohibiting surrender. The Soviets initially claimed to have inflicted 29,085 casualties but later increased this figure to 52, 55,000 and then 61,000 for official histories. According to Sixth Army medical data, Japanese casualties amounted to 7,696 killed, 8,647 wounded, 1,021 missing, and 2,350 sick.
In November 1939, the American consulate in Harbin claimed authoritative information showing Japanese casualties reached 30,000 while Agricultural Minister Yukio Sakurauchi reported figures of 35, 36,000 out of 40,000 participants. Zhukov reported Soviet casualties during the final offensive beginning the 20th of August as 9,284 including 1,701 dead and missing plus 7,583 wounded. In 1993, Grigoriy Krivosheev cited totals of 7,974 killed and 15,251 wounded for the entire campaign. The Soviets lost a large amount of equipment including 253 tanks, 250 aircraft, 96 artillery pieces, and 133 armored cars.
This engagement played an important part in subsequent Japanese conduct in World War II despite being little known in the West. The battle earned the Kwantung Army displeasure from officials in Tokyo not so much due to defeat but because battles were initiated without direct authorization. This defeat combined with Chinese resistance and the signing of the German-Soviet non-aggression pact moved the Imperial General Staff away from the North Strike Group policy favoring seizure of Siberia.
Support shifted instead to the South Strike Group favored by the Navy which wanted to seize resources of Southeast Asia especially petroleum-rich Dutch East Indies. Masanobu Tsuji was one of the strongest proponents of attacking Pearl Harbor yet his experience of Soviet firepower at Nomonhan convinced him not to attack the Soviet Union in 1941. On the 24th of June 1941 two days after war broke out on the Eastern Front, Japanese leaders adopted a resolution not intervening in the German-Soviet war. In August 1941, Japan and the Soviet Union reaffirmed their neutrality pact while the United States imposed an oil embargo threatening to stop the Japanese war effort.
The battle marked the first victory for the soon-to-be-famous Soviet general Zhukov earning him the first of four Hero of the Soviet Union awards. Two other generals Grigori Shtern and Yakov Smushkevich had important roles and also received the award but both were executed during the 1941 Purges. Zhukov himself was promoted and transferred west to the Kiev district where he would later face Germany.
Battle experience gained by Zhukov proved useful in December 1941 at the Battle of Moscow. He used this experience to launch the first successful Soviet counteroffensive against the German invasion. Many units of Siberian armies participated in this attack aided by Soviet spy Richard Sorge who alerted the government that Japan looked south rather than attacking Siberia. A year after defending Moscow, Zhukov planned Operation Uranus at Stalingrad using techniques very similar to Khalkhin Gol. The Red Army kept a large force in the Far East even during bleakest days of the European war with over 1.4 million troops stationed there on the 1st of July 1942.
After World War II fourteen Japanese were charged by delegates of the conquering Soviet Union at the International Military Tribunal for the Far East. They faced charges of initiating aggression against Mongolia and waging war in violation of international law. Kenji Doihara Hiranuma Kiichirō and Seishirō Itagaki were convicted on these specific counts. The anniversary of the battle was first celebrated in the Soviet Union in 1969 marking its 30th anniversary before dwindling in importance after the 50th anniversary.
Only recently has the anniversary made a resurgence as an important event in Mongolian history. The town of Choibalsan hosts the G.K. Zhukov Museum dedicated to both Zhukov and the 1939 battle while Ulaanbaatar also maintains a museum opened on the 19th of August 1979. During the 80th anniversary in 2019 a military parade held in Choibalsan featured tactical formations of Russian Armed Forces alongside Mongolian Armed Forces. Parades occurred in federal subjects surrounding Mongolia including Buryatia Yakutia and Altai Republic with concerts performed by the Alexandrov Ensemble.
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Common questions
What were the dates of the Battles of Khalkhin Gol?
The battles began on the 11th of May 1939 and concluded with a final offensive starting on the 20th of August 1939. The conflict continued through July and August before ending in late summer 1939.
Who commanded Soviet forces during the Battles of Khalkhin Gol?
Comcor Georgy Zhukov arrived on the 5th of June 1939 to lead motorized and armored forces alongside Comcor Yakov Smushkevich. Zhamyangiyn Lhagvasuren served as Zhukov's deputy as Corps Commissar of the Mongolian People Revolutionary Army.
How many Japanese casualties occurred during the Battles of Khalkhin Gol?
Japanese military records reported approximately 20,000 battle and non-battle casualties along with 162 aircraft lost in combat and 42 tanks disabled. Sixth Army medical data listed 7,696 killed, 8,647 wounded, 1,021 missing, and 2,350 sick.
Why did Japan shift its strategy from attacking Siberia to Southeast Asia after the Battles of Khalkhin Gol?
The defeat combined with Chinese resistance and the signing of the German-Soviet non-aggression pact moved the Imperial General Staff away from the North Strike Group policy favoring seizure of Siberia. Support shifted instead to the South Strike Group favored by the Navy which wanted to seize resources of Southeast Asia especially petroleum-rich Dutch East Indies.
What equipment losses did the Soviet Union suffer during the Battles of Khalkhin Gol?
The Soviets lost a large amount of equipment including 253 tanks, 250 aircraft, 96 artillery pieces, and 133 armored cars. They also suffered 9,284 total casualties including 1,701 dead and missing plus 7,583 wounded during the final offensive beginning the 20th of August 1939.