3.188 Fall and Rise of China: From Changkufeng to Nomonhan

Last time we spoke about The Battle of Suixian–Zaoyang-Shatow. Following the brutal 1938 capture of Wuhan, Japanese forces aimed to solidify their hold by launching an offensive against Chinese troops in the 5th War Zone, a rugged natural fortress in northern Hubei and southern Henan. Under General Yasuji Okamura, the 11th Army deployed three divisions and cavalry in a pincer assault starting May 1, 1939, targeting Suixian and Zaoyang to crush Nationalist resistance and secure flanks. Chinese commander Li Zongren, leveraging terrain like the Dabie and Tongbai Mountains, orchestrated defenses with over 200,000 troops, including Tang Enbo's 31st Army Group. By May 23, they recaptured Suixian and Zaoyang, forcing a Japanese withdrawal with heavy losses, over 13,000 Japanese casualties versus 25,000 Chinese, restoring pre-battle lines. Shifting south, Japan targeted Shantou in Guangdong to sever supply lines from Hong Kong. In a massive June 21 amphibious assault, the 21st Army overwhelmed thin Chinese defenses, capturing the port and Chao'an despite guerrilla resistance led by Zhang Fakui. Though losses mounted, Japan tightened its blockade, straining China's war effort amid ongoing attrition.

#188 From Changkufeng to Nomonhan

Welcome to the Fall and Rise of China Podcast, I am your dutiful host Craig Watson. But, before we start I want to also remind you this podcast is only made possible through the efforts of Kings and Generals over at Youtube. Perhaps you want to learn more about the history of Asia? Kings and Generals have an assortment of episodes on history of asia and much more so go give them a look over on Youtube. So please subscribe to Kings and Generals over at Youtube and to continue helping us produce this content please check out www.patreon.com/kingsandgenerals. If you are still hungry for some more history related content, over on my channel, the Pacific War Channel where I cover the history of China and Japan from the 19th century until the end of the Pacific War.

Well hello again, and yes you all have probably guessed we are taking another detour. Do not worry I hope to shorten this one a bit more so than what became a sort of mini series on the battle of Changkufeng or Battle of Lake Khasan. What we are about to jump into is known in the west as the battle of khalkin Gol, by the Japanese the Nomohan incident. But first I need to sort of set the table up so to say. So back on August 10th, 1938 the Litvinov-Shigemitsu agreement established a joint border commission tasked with redemarcating the disputed boundary between the Soviet Union and Japanese-controlled Manchukuo. However, this commission never achieved a mutually agreeable definition of the border in the contested area. In reality, the outcome was decided well before the group's inaugural meeting. Mere hours after the cease-fire took effect on the afternoon of August 11, General Grigory Shtern convened with a regimental commander from Japan's 19th Division to coordinate the disengagement of forces.

With the conflict deemed "honorably" concluded, Japan's Imperial General Headquarters mandated the swift withdrawal of all Japanese troops to the west bank of the Tumen River. By the night of August 13, as the final Japanese soldier crossed the river, it effectively became the de facto border. Soviet forces promptly reoccupied Changkufeng Hill and the adjacent heights—a move that would carry unexpected and profound repercussions. Authoritative Japanese military analyses suggest that if negotiations in Moscow had dragged on for just one more day, the 19th Division would likely have been dislodged from Changkufeng and its surrounding elevations. Undoubtedly, General Shtern's infantry breathed a sigh of relief as the bloodshed ceased. Yet, one can't help but question why Moscow opted for a cease-fire at a juncture when Soviet troops were on the cusp of total battlefield triumph.

Perhaps Kremlin leaders deemed it wiser to settle for a substantial gain, roughly three-quarters of their objectives, rather than risk everything. After all, Japan had mobilized threatening forces in eastern Manchuria, and the Imperial Army had a history of impulsive, unpredictable aggression. Moreover, amid the escalating crisis over Czechoslovakia, Moscow may have been wary of provoking a broader Asian conflict. Another theory posits that Soviet high command was misinformed about the ground situation. Reports of capturing a small segment of Changkufeng's crest might have been misinterpreted as control over the entire ridge, or an imminent full takeover before midnight on August 10. The unexpected phone call from Foreign Minister Maxim Litvinov to the Japanese embassy that night—proposing a one-kilometer Japanese retreat in exchange for a cease-fire along existing lines—hints at communication breakdowns between Shtern's headquarters and the Kremlin. Ironically, such lapses may have preserved Japanese military honor, allowing the 19th Division's evacuation through diplomacy rather than defeat.

Both sides endured severe losses. Initial Japanese press reports claimed 158 killed and 740 wounded. However, the 19th Division's medical logs reveal a grimmer toll: 526 dead and 914 injured, totaling 1,440 casualties. The true figure may have climbed higher, possibly to 1,500–2,000. Following the armistice, the Soviet news agency TASS reported 236 Red Army fatalities and 611 wounded. Given Shtern's uphill assaults across open terrain against entrenched positions, these numbers seem understated. Attackers in such scenarios typically suffered two to three times the defenders' losses, suggesting Soviet casualties ranged from 3,000 to 5,000. This aligns with a Soviet Military Council investigation on August 31, 1938, which documented 408 killed and 2,807 wounded. Japanese estimates placed Soviet losses even higher, at 4,500–7,000.

Not all victims perished in combat. Marshal Vasily Blyukher, a decorated Soviet commander, former warlord of the Far East, and Central Committee candidate, was summoned to Moscow in August 1938. Relieved of duty in September and arrested with his family in October, he faced charges of inadequate preparation against Japanese aggression and harboring "enemies of the people" within his ranks. On November 9, 1938, Blyukher died during interrogation a euphemism for torture-induced death.Other innocents suffered as well. In the wake of the fighting, Soviet authorities deported hundreds of thousands of Korean rice farmers from the Ussuri region to Kazakhstan, aiming to eradicate Korean settlements that Japanese spies had allegedly exploited.

The Changkufeng clash indirectly hampered Japan's Wuhan offensive, a massive push to subdue China. The influx of troops and supplies for this campaign was briefly disrupted by the border flare-up. Notably, Kwantung Army's 2nd Air Group, slated for Wuhan, was retained due to the Soviet threat. Chiang Kai-shek's drastic measure, breaching the Yellow River dikes to flood Japanese advance routes—further delayed the assault. By October 25, 1938, when Japanese forces captured Hankow, Chiang had relocated his capital to distant Chungking. Paradoxically, Wuhan's fall cut rail links from Canton inland, heightening Chiang's reliance on Soviet aid routed overland and by air from Central Asia. Japan secured a tactical win but missed the decisive blow; Chinese resistance persisted, pinning down a million Japanese troops in occupation duties.

What was the true significance of Changkufeng? For General Koiso Suetaka and the 19th Division, it evoked a mix of bitterness and pride. Those eager for combat got their share, though not on their terms. To veterans mourning fallen comrades on those desolate slopes, it might have felt like senseless tragedy. Yet, they fought valiantly under dire conditions, holding firm until a retreat that blended humiliation with imperial praise, a bittersweet inheritance. For the Red Army, it marked a crucial trial of resolve amid Stalin's purges. While Shtern's forces didn't shine brilliantly, they acquitted themselves well in adversity. The U.S. military attaché in Moscow observed that any purge-related inefficiencies had been surmounted, praising the Red Army's valor, reliability, and equipment. His counterpart in China, Colonel Joseph Stilwell, put it bluntly: the Soviets "appeared to advantage," urging skeptics to rethink notions of a weakened Red Army. Yet, by World War II's eve, many British, French, German, and Japanese leaders still dismissed it as a "paper tiger."

Soviet leaders appeared content, promoting Shtern to command the Transbaikal Military District and colonel general by 1940, while honoring "Heroes of Lake Khasan" with medals. In a fiery November 7, 1938, speech, Marshal Kliment Voroshilov warned that future incursions would prompt strikes deep into enemy territory. Tokyo's views diverged sharply. Many in the military and government saw it as a stain on Imperial Army prestige, especially Kwantung Army, humiliated on Manchukuo soil it swore to protect. Colonel Masanobu Tsuji Inada, however, framed it as a successful reconnaissance, confirming Soviet border defense without broader aggression, allowing the Wuhan push to proceed safely. Critics, including Major General Gun Hashimoto and historians, questioned this. They argued IGHQ lacked contingency plans for a massive Soviet response, especially with Wuhan preparations underway since June. One expert warned Japan had "played with fire," risking Manchuria and Korea if escalation occurred.

Yet, Japanese commanders gleaned few lessons, downplaying Soviet materiel superiority and maintaining disdain for Red Army prowess. The 19th Division's stand against outnumbered odds reinforced this hubris, as did tolerance for local insubordination—attitudes that would prove costly. The Kremlin, conversely, learned Japan remained unpredictable despite its China quagmire. But for Emperor Hirohito's intervention, the conflict might have ballooned. Amid purges and the Czech crisis, Stalin likely viewed it as a reminder of eastern vulnerabilities, especially with Munich advancing German threats westward. Both sides toyed with peril. Moderation won in Tokyo, but Kwantung Army seethed. On August 11, Premier Fumimaro Konoye noted the need for caution. Kwantung, however, pushed for and secured control of the disputed salient from Chosen Army by October 8, 1938. Even winter's chill couldn't quench their vengeful fire, setting the stage for future confrontations.

A quick look at the regional map reveals how Manchukuo and the Mongolian People's Republic each jut into the other's territory like protruding salients. These bulges could be seen as aggressive thrusts into enemy land, yet they also risked encirclement and absorption by the opposing empire. A northward push from western Manchuria through Mongolia could sever the MPR and Soviet Far East from the USSR's heartland. Conversely, a pincer movement from Mongolia and the Soviet Maritime Province might envelop and isolate Manchukuo. This dynamic highlights the frontier's strategic volatility in the 1930s. One particularly tense sector was the broad Mongolian salient extending about 150 miles eastward into west-central Manchukuo. There, in mid-1939, Soviet-Japanese tensions erupted into major combat. Known to the Japanese as the Nomonhan Incident and to the Soviets and Mongolians as the Battle of Khalkhin Gol, this clash dwarfed the earlier Changkufeng affair in scale, duration, and impact. Spanning four months and claiming 30,000 to 50,000 casualties, it amounted to a small undeclared war, the modern era's first limited conflict between great powers.

The Mongolian salient features vast, semiarid plains of sandy grassland, gently rolling terrain dotted with sparse scrub pines and low shrubs. The climate is unforgivingly continental: May brings hot days and freezing nights, while July and August see daytime highs exceeding 38°C (100°F in American units), with cool evenings. Swarms of mosquitoes and massive horseflies necessitate netting in summer. Rainfall is scarce, but dense morning fogs are common in August. Come September, temperatures plummet, with heavy snows by October and midwinter lows dipping to –34°C. This blend of North African aridity and North Dakotan winters supports only sparse populations, mainly two related but distinct Mongol tribes. The Buriat (or Barga) Mongols migrated into the Nomonhan area from the northwest in the late 17th to early 18th centuries, likely fleeing Russian expansion after the 1689 Treaty of Nerchinsk. Organized by Manchu emperors between 1732 and 1735, they settled east of the river they called Khalkhin Gol (Mongolian for "river"), in lands that would later become Manchukuo. The Khalkha Mongols, named for the word meaning "barrier" or "shield," traditionally guarded the Mongol Empire's northern frontiers. Their territories lay west of the Buriats, in what would become the MPR. For centuries, these tribes herded livestock across sands, river crossings, and desert paths, largely oblivious to any formal borders.

For hundreds of years, the line dividing the Mongolian salient from western Manchuria was a hazy administrative divide within the Qing Empire. In the 20th century, Russia's detachment of Outer Mongolia and Japan's seizure of Manchuria transformed this vague boundary into a frontline between rival powers. The Nomonhan Incident ignited over this contested border. Near the salient's northeastern edge, the river, called Khalkhin Gol by Mongols and Soviets, and Halha by Manchurians and Japanese, flows northwest into Lake Buir Nor. The core dispute: Was the river, as Japan asserted, the historic boundary between Manchukuo and the MPR? Soviet and MPR officials insisted the line ran parallel to and 10–12 miles east of the river, claiming the intervening strip.

Japan cited no fewer than 18 maps, from Chinese and Japanese sources, to support the river as the border, a logical choice in such barren terrain, where it served as the sole natural divider. Yet, Soviets and Mongolians countered with evidence like a 1919 Chinese postal atlas and maps from Japanese and Manchukuoan agencies (1919–1934). Unbeknownst to combatants, in July 1939, China's military attaché in Moscow shared a 1934 General Staff map with his American counterpart, showing the border east of the river. Postwar Japanese studies of 18th-century Chinese records confirm that in 1734, the Qing emperor set a boundary between Buriat and Khalkha Mongols east of the river, passing through the hamlet of Nomonhan—as the Soviets claimed. However, Kwantung Army Headquarters dismissed this as non-binding, viewing it as an internal Qing affair without Russian involvement. Two former Kwantung Army officers offer a pragmatic explanation: From 1931 to 1935, when Soviet forces in the Far East were weak, Japanese and Manchukuoan authorities imposed the river as the de facto border, with MPR acquiescence. By the mid- to late 1930s, as Soviet strength grew, Japan refused to yield, while Mongolians and Soviets rejected the river line, sparking clashes. In 1935, Kwantung Army revised its maps to align with the river claim. From late that year, the Lake Buir Nor–Halha sector saw frequent skirmishes between Manchukuoan and MPR patrols.

Until mid-1938, frontier defense in northwestern Manchukuo fell to the 8th Border Garrison Unit , based near Hailar. This 7,000-man force, spread thin, lacked mobility, training, and, in Kwantung Army's eyes, combat readiness. That summer, the newly formed 23rd Division, under Kwantung Army, took station at Hailar, absorbing the 8th BGU under its command, led by Lieutenant General Michitaro Komatsubara. At 52, Komatsubara was a premier Russian specialist in the Imperial Army, with stints as military attaché in the USSR and head of Kwantung's Special Services Agency in Harbin. Standing 5'7" with a sturdy build, glasses, and a small mustache, he was detail-oriented, keeping meticulous diaries, writing lengthy letters, and composing poetry, though he lacked combat experience. Before departing Tokyo in July 1938, Komatsubara received briefings from Colonel Masazumi Inada, AGS Operations Section chief. Amid planning for Changkufeng, Inada urged calm on the Manchukuo-MPR border given China's ongoing campaigns. Guidelines: Ignore minor incidents, prioritize intelligence on Soviet forces east of Lake Baikal, and study operations against the Soviet Far East's western sector. Familiar with the region from his Harbin days, Komatsubara adopted a low-key approach. Neither impulsive nor aggressive, he kept the green 23rd Division near Hailar, delegating patrols to the 8th BGU. An autumn incident underscores his restraint.

On November 1, 1938, an 8th BGU patrol was ambushed by MPR forces. Per Japanese accounts, the three-man team, led by a lieutenant, strayed too close to the border and was attacked 50 meters inside Manchukuo. The lieutenant escaped, but his men died. Komatsubara sent an infantry company to secure the site but forbade retaliation. He pursued body recovery diplomatically, protested to MPR and Soviet officials, and disciplined his officers: garrison leaders got five days' confinement for poor troop training, the lieutenant thirty days. Despite this caution, pressures at AGS and KwAHQ were mounting, poised to thrust the 23rd Division into fierce battle.

Modern militaries routinely develop contingency plans against potential adversaries, and the mere existence of such strategies doesn't inherently signal aggressive intentions. That said, shifts in Japan's operational planning vis-à-vis the Soviet Union may have inadvertently fueled the Nomonhan Incident. From 1934 to 1938, Japanese war scenarios emphasized a massive surprise assault in the Ussuri River region, paired with defensive holding actions in northwestern Manchuria. However, between mid-1938 and early 1939, a clandestine joint task force from the Army General Staff and Kwantung Army's Operations Departments crafted a bold new blueprint. This revised strategy proposed containing Soviet forces in the east and north while unleashing a full-scale offensive from Hailar, advancing west-northwest toward Chita and ultimately Lake Baikal. The goal: sever the Transbaikal Soviet Far East from the USSR's core. Dubbed Plan Eight-B, it gained Kwantung Army's endorsement in March 1939. Key architects—Colonels Takushiro Hattori and Masao Terada, along with Major Takeharu Shimanuki—were reassigned from AGS to Kwantung Army Headquarters to oversee implementation. The plan anticipated a five-year buildup before execution, with Hattori assuming the role of chief operations staff officer.

A map review exposes a glaring vulnerability in Plan Eight-B: the Japanese advance would leave its southern flank exposed to Soviet counterstrikes from the Mongolian salient. By spring 1939, KwAHQ likely began perceiving this protrusion as a strategic liability. Notably, at the outbreak of Nomonhan hostilities, no detailed operational contingencies for the area had been formalized. Concurrently, Japan initiated plans for a vital railroad linking Harlun Arshan to Hailar. While its direct tie to Plan Eight-B remains unclear, the route skirted perilously close to the Halha River, potentially heightening KwAHQ's focus on the disputed Mongolian salient. In early 1939, the 23rd Division intensified reconnaissance patrols near the river. Around this time, General Grigory Shtern, freshly appointed commander of Soviet Far Eastern forces, issued a public warning that Japan was gearing up for an assault on the Mongolian People's Republic.

As Plan Eight-B took shape and railroad proposals advanced, KwAHQ issued a strikingly confrontational set of guidelines for frontier troops. These directives are often cited as a catalyst for the Nomonhan clash, forging a chain linking the 1937 Amur River incident, the 1938 Changkufeng debacle, and the 1939 conflict.Resentment had festered at KwAHQ over perceived AGS meddling during the Amur affair, which curtailed their command autonomy. This frustration intensified at Changkufeng, where General Kamezo Suetaka's 19th Division endured heavy losses, only for the contested Manchukuoan territory to be effectively ceded. Kwantung Army lobbied successfully to wrest oversight of the Changkufeng salient from Chosen Army. In November 1938, Major Masanobu Tsuji of KwAHQ's Operations Section was sent to survey the site. The audacious officer was dismayed: Soviet forces dominated the land from the disputed ridge to the Tumen River. Tsuji undertook several winter reconnaissance missions. His final outing in March 1939 involved leading 40 men to Changkufeng's base. With rifles slung non-threateningly, they ascended to within 200 yards of Soviet lines, formed a line, and urinated in unison, eliciting amused reactions from the enemy. They then picnicked with obentos and sake, sang army tunes, and left gifts of canned meat, chocolates, and whiskey. This theatrical stunt concealed Tsuji's real aim: covert photography proving Soviet fortifications encroached on Manchukuoan soil.

Tsuji was a singular figure. Born of modest means, he embodied a modern samurai ethos, channeling a sharp intellect into a frail, often ailing body through feats of extraordinary daring. A creative tactician, he thrived in intelligence ops, political scheming, aerial scouting, planning, and frontline command—excelling across a tumultuous career. Yet, flaws marred his brilliance: narrow bigotry, virulent racism, and capacity for cruelty. Ever the ambitious outsider, Tsuji wielded outsized influence via gekokujo—Japan's tradition of subordinates steering policy from below. In 1939, he was a major, but his pivotal role at Nomonhan stemmed from this dynamic. Back in Hsinking after his Changkufeng escapade, Tsuji drafted a response plan: negotiate border "rectification" with the Soviets; if talks failed, launch an attack to expel intruders. Kwantung Army adopted it. Deputy Chief of Staff Major General Otozaburo Yano flew to Tokyo with Tsuji's photos, seeking AGS approval. There, he was rebuffed—Changkufeng was deemed settled, and minor violations should be overlooked amid Tokyo's aversion to Soviet conflict. Yano's plea that leniency would invite aggression was countered by notes on Europe's tensions restraining Moscow. Yano's return sparked outrage at KwAHQ, seen as AGS thwarting their imperial duty to safeguard Manchukuo. Fury peaked in the Operations Section, setting the stage for Tsuji's drafting of stringent new frontier guidelines: "Principles for the Settlement of Soviet-Manchukuoan Border Disputes." The core tenet: "If Soviet troops transgress the Manchukuoan frontiers, Kwantung Army will nip their ambitions in the bud by completely destroying them." Specific directives for local commanders included: "If the enemy crosses the frontiers … annihilate him without delay, employing strength carefully built up beforehand. To accomplish our mission, it is permissible to enter Soviet territory, or to trap or lure Soviet troops into Manchukuoan territory and allow them to remain there for some time… . Where boundary lines are not clearly defined, area defense commanders will, upon their own initiative, establish boundaries and indicate them to the forward elements… . In the event of an armed clash, fight until victory is won, regardless of relative strengths or of the location of the boundaries. If the enemy violates the borders, friendly units must challenge him courageously and endeavor to triumph in their zone of action without concerning themselves about the consequences, which will be the responsibility of higher headquarters."

Major Tsuji Masanobu later justified the new guidelines by pointing to the "contradictory orders" that had hamstrung frontier commanders under the old rules. They were tasked with upholding Manchukuo's territorial integrity yet forbidden from actions that might spark conflict. This, Tsuji argued, bred hesitation, as officers feared repercussions for decisive responses to incursions. The updated directives aimed to alleviate this "anxiety," empowering local leaders to act boldly without personal liability. In truth, Tsuji's "Principles for the Settlement of Soviet-Manchukuoan Border Disputes" were more incendiary than conciliatory. They introduced provocative measures: authorizing commanders to unilaterally define unclear boundaries, enforce them with immediate force "shoot first, ask questions later", permit pursuits into enemy territory, and even encourage luring adversaries across the line. Such tactics flouted both government policy and official army doctrine, prioritizing escalation over restraint.

The proposals sparked intense debate within Kwantung Army's Operations Section. Section chief Colonel Takushiro Hattori and Colonel Masao Terada outranked Tsuji, as did Major Takeharu Shimanuki, all recent transfers from the Army General Staff. Tsuji, however, boasted longer tenure at Kwantung Army Headquarters since April 1936 and in Operations since November 1937, making him the de facto veteran. Hattori and Terada hesitated to challenge the assertive major, whose reputation for intellect, persuasion, and deep knowledge of Manchuria commanded respect. In a 1960 interview, Shimanuki recalled Tsuji's dominance in discussions, where his proactive ideas often swayed the group. Unified, the section forwarded Tsuji's plan to Kwantung Army Command. Commander Lieutenant General Kenkichi Ueda consulted Chief of Staff General Rensuke Isogai and Vice Chief General Otozaburo Yano, seasoned leaders who should have spotted the guidelines' volatility. Yet, lingering grudges from AGS "interference" in past incidents like the Amur River and Changkufeng clouded their judgment. Ueda, Isogai, and Tsuji shared history from the 1932 Shanghai Incident: Tsuji, then a captain, led a company in the 7th Regiment under Colonel Isogai, with Yano as staff officer and Ueda commanding the 9th Division. Tsuji was wounded there, forging bonds of camaraderie. This "clique," which grew to include Hattori, Terada, and Shimanuki, amplified Tsuji's influence. Despite Isogai's initial reservations as the group's moderate voice, the guidelines won approval. Ueda issued them as Kwantung Army Operations Order 1488 on April 25, 1939, during a division commanders' conference at KwAHQ.

A routine copy reached AGS in Tokyo, but no formal reply came. Preoccupied with the China War and alliance talks with Germany, AGS may have overlooked border matters. Colonel Masazumi Inada, AGS Operations head, later noted basic acceptance of Order 1488, with an informal expectation—relayed to Hattori and Terada—of prior consultation on violations. KwAHQ dismissed this as another Tokyo intrusion on their autonomy. Some Japanese analysts contend a stern AGS rejection might have prevented Nomonhan's catastrophe, though quelling Kwantung's defiance could have required mass staff reassignments, a disruptive step AGS avoided. Tsuji countered that permitting forceful action at Changkufeng would have deterred Nomonhan altogether, underscoring the interconnectedness of these clashes while implicitly critiquing the 1939 battle's location. Undeniably, Order 1488's issuance on April 25 paved the way for conflict three weeks later. Japanese records confirm that Khalkha Mongols and MPR patrols routinely crossed the Halha River—viewed by them as internal territory, 10 miles from the true border. Such crossings passed uneventfully in March and April 1939. Post-Order 1488, however, 23rd Division commander General Michitaro Komatsubara responded aggressively, setting the stage for escalation.

The Nomonhan Incident ignited with a border clash on May 11–12, 1939, that rapidly spiraled into a major conflict. Over a dozen "authoritative" accounts exist, varying in viewpoint, focus, and specifics. After cross-referencing these sources, a coherent timeline emerges. On the night of May 10–11, a 20-man Mongolian People's Republic border patrol crossed eastward over the Halha River (known as Khalkhin Gol to Mongols and Soviets). About 10 miles east, atop a 150-foot sandy hill, lay the tiny hamlet of Nomonhan, a cluster of crude huts housing a few Mongol families. Just south flowed the Holsten River, merging westward into the broader Halha. By morning on May 11, Manchukuoan forces spotted the MPR patrol north of the Holsten and west of Nomonhan. In the MPR/Soviet perspective, Nomonhan Hill marked the Mongolia-Manchuria border. To Manchukuoans and Japanese, it sat 10 miles inside Manchukuo, well east of the Halha.

A 40-man Manchukuoan cavalry unit repelled the Mongolians back across the river, inflicting initial casualties on both sides—the Manchukuoans drawing first blood. The MPR patrol leader exaggerated the attackers as 200 strong. The next day, May 12, a 60-man MPR force under Major P. Chogdan evicted the Manchukuoans from the disputed zone, reestablishing positions between the Halha and Nomonhan. The Manchukuoans, in turn, reported facing 700 enemies. Sporadic skirmishes and maneuvering persisted through the week. On May 13, two days post-clash, the local Manchukuoan commander alerted General Michitaro Komatsubara's 23rd Division headquarters in Hailar. Simultaneously, Major Chogdan reported to Soviet military command in Ulaanbaatar, Mongolia's capital. What began as a Mongolian-Manchukuoan spat was poised to draw in Soviet and Japanese patrons. Attributing the May 10–11 violation hinges on border interpretations: both sides claimed the Halha-Nomonhan strip. Yet, most accounts concur that Manchukuoan forces initiated the fighting. Post-May 13 notifications to Moscow and Tokyo clarify the record thereafter. Midday on May 13, Komatsubara was leading a staff conference on the newly issued Kwantung Army Operations Order 1488—Major Tsuji Masanobu's aggressive border guidelines. Ironically, the first Nomonhan combat report arrived mid-discussion. Officers present recall Komatsubara deciding instantly to "destroy the invading Outer Mongolian forces" per Order 1488.

That afternoon, he informed Kwantung Army Headquarters of the incident and his intent to eradicate the intruders, requesting air support and trucks. General Kenkichi Ueda, Kwantung commander, approved Komatsubara's "positive attitude," dispatching six scout planes, 40 fighters, 10 light bombers, two anti-aircraft batteries, and two motorized transport companies. Ueda added a caveat: exercise "extreme caution" to prevent escalation—a paradoxical blend of destruction and restraint, reflective of KwAHQ's fervent mood. Ueda relayed the details to Tokyo's Army General Staff, which responded that Kwantung should handle it "appropriately." Despite Kwantung's impulsive reputation, Tokyo deferred, perhaps trusting the northern strategic imbalance, eight Japanese divisions versus 30 Soviet ones from Lake Baikal to Vladivostok, would enforce prudence. This faith proved misguided.

On May 14, Major Tsuji flew from KwAHQ for aerial reconnaissance over Nomonhan, spotting 20 horses but no troops. Upon landing, a fresh bullet hole in his plane confirmed lingering MPR presence east of the Halha. Tsuji briefed 23rd Division staff and reported to Ueda that the incident seemed minor. Aligning with Order 1488's spirit, Komatsubara deployed a force under Lieutenant Colonel Yaozo Azuma: an armored car company, two infantry companies, and a cavalry troop. Arriving at Nomonhan on May 15, Azuma learned most MPR forces had retreated westward across the Halha the prior night, with only token elements remaining, and those withdrawing. Undeterred, he pursued. The advance met scant resistance, as foes had crossed the river. However, Japanese light bombers struck a small MPR concentration on the west bank, Outpost Number 7, killing two and wounding 15 per MPR reports; Japanese claimed 30–40 kills. All agree: the raid targeted undisputed MPR territory. Hearing of May 15's events, Komatsubara deemed the Mongolians sufficiently rebuked and recalled Azuma to Hailar on May 16. KwAHQ concurred, closing the matter. Soviet leaders, however, saw it differently.

Mid-May prompted Soviet support for the MPR under their 1936 Mutual Defense Pact. The Red Army's 57th Corps, stationed in Mongolia, faced initial disarray: Commander Nikolai Feklenko was hunting, Chief of Staff A. M. Kushchev in Ulan Ude with his ill wife. Moscow learned of clashes via international press from Japanese sources, sparking Chief of Staff Boris Shaposhnikov's furious inquiry. Feklenko and Kushchev rushed back to Ulaanbaatar, dispatching a mixed force—a battalion from the 149th Infantry Regiment (36th Division), plus light armor and artillery from the 11th Tank Brigade—to Tamsag Bulak, 80 miles west of the Halha. Led by Major A. E. Bykov, it bolstered the MPR's 6th Cavalry Division. Bykov and Cavalry Commander Colonel Shoaaiibuu inspected the site on May 15, post-Azum's departure. The cavalry arrived two days later, backed by Bykov (ordered to remain west of the river and avoid combat if possible). Some MPR troops recrossed, occupying the disputed zone. Clashes with Manchukuoan cavalry resumed and intensified. Notified of renewed hostilities, Komatsubara viewed it as defiance, a personal affront. Emboldened by Order 1488, he aimed not just to repel but to encircle and annihilate. The incident was on the verge of major expansion.

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The ghosts of the Changufeng incident have come back to haunt both the USSR and Japan. Those like Tsuji Masanobu instigated yet another border clash that would erupt into a full blown battle that would set a precedent for both nations until the very end of WW2.