3.176 Fall and Rise of China: Changkufeng Incident

Last time we spoke about the Soviet-Japanese Border Conflict. The border between Soviet Manchuria and Japanese-occupied territories emerges not as a single line but as a mosaic of contested spaces, marks, and memories. A sequence of incidents, skirmishes along the Chaun and Tumen rivers, reconnaissance sorties, and the complex diplomacy of Moscow, Tokyo, and peripheral actors to trace how risk escalated from routine patrols to calibrated leverage. On the ground, terrain functioned as both obstacle and argument: ridges like Changkufeng Hill shaping sightlines, river valleys shaping decisions, and markers weathered by snow, wind, and drift. In command tents, officers translated terrain into doctrine: contingency plans, supply routes, and the precarious calculus of restraint versus escalation. Both nations sought to establish firmer defensive barriers against the other. Inevitably they were destined to clash, but how large that clash would become, nobody knew.

 

#176 The Changkufeng Incident

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.

In the last episode we broke down a general history of the Soviet-Japanese Border Conflict and how it escalated significantly by 1938. Colonel Inada Masazum serving as chief of the 2nd Operations Section within the Operations Bureau in March of 1938 would play a significant role in this story. When the Japanese command’s attention was drawn to the area of Changkufeng, consideration was given to the ownership and importance of the disputed high ground. Inada and his operations section turned to an appraisal of the geography. The officers had been impressed by the strategic importance of the Tumen, which served to cut off the hill country from North Korea. In the Changkufeng area, the river was a muddy 600 to 800 meters wide and three to five meters deep. Japanese engineers had described rowing across the stream as “rather difficult.” 

Russian roads on the left bank were very good, according to Japanese intelligence. Heavy vehicles moved easily; the Maanshan section comprised the Russians’ main line of communications in the rear. To haul up troops and materiel, the Russians were obliged to use trucks and ships, for there were no railways apart from a four-kilometer line between the harbor and town of Novokievsk. Near Changkufeng, hardly any roadways were suitable for vehicular traffic. On the right, or Korean, bank of the Tumen, there were only three roads suitable for vehicular traffic, but even these routes became impassable after a day or two of rain.

In the sector between Hill 52 to the south and Shachaofeng to the north, the most pronounced eminences were Chiangchunfeng and the humps of Changkufeng. Rocky peaks were characteristically shaped like inverted T’s, which meant many dead angles against the crests. The gentle slopes would allow tanks to move but would restrict their speed, as would the ponds and marshes. In general, the terrain was treeless and afforded little cover against aircraft. Against ground observation or fire, corn fields and tall miscanthus grass could provide some shielding. Between Chiangchunfeng and the Tumen, which would have to serve as the main route of Japanese supply, the terrain was particularly sandy and hilly. This rendered foot movement difficult but would reduce the effectiveness of enemy bombs and shells. The high ground east of Khasan afforded bases for fire support directed against the Changkufeng region. Plains characterized the rest of the area on the Soviet side, but occasional streams and swamps could interfere with movement of tanks and trucks. The only towns or villages were Novokievsk, Posyet, Yangomudy, and Khansi. At Kozando there were a dozen houses; at Paksikori, a few. The right bank was farmed mainly by Koreans, whose scattered cottages might have some value for billeting but offered none for cover. On the left bank, the largest hamlets were Fangchuanting, with a population of 480 dwelling in 73 huts, and Yangkuanping, where there were 39 cottages. Shachaofeng was uninhabited.

Japanese occupation of Changkufeng would enable observation of the plain stretching east from Posyet Bay, although intelligence made no mention of Soviet naval bases, submarine pens, or airstrips in the immediate area of Posyet, either in existence or being built in 1938. As Inada knew, the Japanese Navy judged that Posyet Bay might have another use, as a site for Japanese landing operations in the event of war. In Russian hands, the high ground would endanger the Korean railway. This line, which started from Najin in northeastern Korea, linked up with the vital system in Manchuria at the town of Tumen and provided a short cut, if not a lifeline, between Japan and the Kwantung Army and Manchuria from across the Sea of Japan. Even from relatively low Changkufeng, six or seven miles of track were exposed to Soviet observation between Hongui and Shikai stations. The port of Najin, with its fortress zone, lay 11 miles southwest; Unggi lay even nearer. It was not the danger of Japanese shelling of Vladivostok, at an incredible range of 80 miles that was at stake but the more realistic hypothesis of Russian shelling of the rail line, and Russian screening of the Soviet side of the border. Hills and questions were thought to have two sides. It was the consensus of Japanese that Changkufeng Hill’s potential value to the Russians far outweighed its possible benefits to them, or at least that the Japanese had more to lose if the Russians took the high ground by the Tumen. Inada nurtured few illusions concerning the intrinsic value of the heights.

Despite the fact that the high command always had good reasons for quiescence in the north, Inada believed that the latest border difficulty could not be overlooked. By mid-July 1938 Inada’s thoughts crystallized. The Japanese would conduct a limited reconnaissance in force known as iryoku teisatsu in the strategic sense. Whereas, at the tactical schoolbook level, this might mean the dispatch of small forces into enemy territory to seek local combat intelligence, at the Imperial General Headquarters level the concept was far more sweeping. There would also be useful evidence of mobilization and other buildup procedures. The affair at Changkufeng was merely a welcome coincidence, something started by the Russians but liable to Japanese exploration. Inada had no intention of seizing territory, of becoming involved in a war of attrition at a remote and minor spot, or of provoking hostilities against the USSR. The Russians would comprehend the nature of the problem, too. If they were interested in interfering seriously with the Japanese, there were numberless better locations to cause trouble along the Manchurian front; those were the places to watch. The cramped Changkufeng sector, described as “narrow like a cat’s brow,” could too readily be pinched off from Hunchun to render it of strategic value to either side. The bog land to the north interfered with the use of armored forces, while artillery sited on the heights along the Tumen in Korea could as easily control the area as batteries emplaced east of the lake. It was Inada’s professional opinion that the Russians could commit three or four infantry divisions there at most, with no mechanized corps—no heavy tanks, in particular. No decisive battle could be waged, although, once the Russians became involved, they might have to cling to the hill out of a sense of honor. The military action would be meaningless even if the Japanese let the Russians have the heights.

For their part, the Japanese would ostensibly be fighting to secure the boundary and to hold Changkufeng peak, beyond which they would not move a step onto Soviet soil. There would be no pursuit operations. Troop commitment would be limited to about one division without tank support. Japanese Air Force intervention would be forbidden. Matters would be directed entirely by Imperial General Headquarters working through the Korea Army chain of command and carried out by the local forces. Calm, clear, and dispassionate overall estimates and instructions would be based on materials available only in Tokyo. The command would not allow the Kwantung Army to touch the affair. Inada foresaw that the Japanese government might also seek a settlement through diplomacy. Although border demarcation was desirable and should be sought, the command would not insist on it, nor would it demand permanent occupation of Changkufeng summit. As soon as reconnaissance objectives had been achieved, the local forces would be withdrawn. As Inada described it “In the process, we would have taught the Russians some respect and given them a lesson concerning their repeated, high-handed provocations and intrusions. If a show of force sufficed to facilitate the negotiations and cause the Russians to back down, so much the better; the affair would be over and my point proved.”

The instrument for carrying out Inada’s strategic design appeared to be ideal, the 19th Division, strenuously trained and high-spirited. It could be expected to perform very well if unleashed within defined limits. Colonel Suetaka was just the commander to direct local operations. Since he had been pleading to fight in China, an operation at Changkufeng might prove to be an excellent “safety valve.” His staff was full of experienced, fierce warriors eager for battle. Until recently, the Korea Army commanding general had wisely kept the aggressive division away from Changkufeng Hill, but now Imperial general headquarters had its own overriding ideas and needs. How could the Japanese ensure that any military action would remain limited if the Russians chose to respond with vigor? Naturally, one infantry division, without armor or air support, could not withstand all of the Soviet forces in the maritime province. Inada answered that the mission to be assigned the 19th Division was merely the recapture of Changkufeng crest. If the Japanese side had to break off the operation, evacuation would be effected voluntarily and resolutely on Imperial general headquarters responsibility, without considerations of “face.” At worst, the Japanese might lose one division, but the affair would be terminated at the Tumen River without fail. “Even so, we ought to be able to prove our theory as well as demonstrate our true strength to the Russians.” In case the Soviets opted for more than limited war, the Japanese were still not so overextended in China that they could not alter their strategic disposition of troops. Although the Kwantung Army’s six divisions were outnumbered four to one and the Japanese were not desirous of a war at that moment, the first-class forces in Manchuria could make an excellent showing. In addition, the high command possessed armor, heavy artillery, fighters, and bombers, held in check in Manchuria and Korea, as well as reserves in the homeland. There was also the 104th Division, under tight Imperial general headquarters control, in strategic reserve in southern Manchuria. Inada recalled “How would the Russians react? That was the answer I sought. Victory in China depended on it.”

By mid-July, the high command, at Inada’s urging, had worked out a plan titled, “Imperial General headqaurters Essentials for Dealing with the Changkufeng Incident.” Tada’s telegram of 14 July to Koiso described succinctly the just-decided policy: the central authorities concurred with the Korea Army’s opinion regarding the Changkufeng affair, then in embryo. Considering that Changkufeng Hill posed a direct threat to the frontier of Korea, Imperial General headqaurters would immediately urge the foreign ministry to lodge a stern protest. Next day, Tojo sent a telegram stating the Japanese policy of employing diplomacy; whether the Russians should be evicted by force required cautious deliberation in case the USSR did not withdraw voluntarily.

On the basis of the guidance received from Imperial General headqaurters, the Korea Army drew up its own plan, “Essentials for Local Direction of the Changkufeng Incident,” on 15 July. Intelligence officer Tsuchiya Sakae was sent promptly to the front from Seoul. At the same time, military authorities allowed the press to release news that Soviet troops were constructing positions inside Manchurian territory in an “obvious provocation.” The government of Manchukuo was demanding an immediate withdrawal. Even then, those Japanese most closely connected with the handling of the Changkufeng Incident were not in agreement that everybody at command level was as ardent a proponent of reconnaissance in force as Inada claimed to be. Some thought that most, if not all, of his subordinates, youthful and vigorous, were in favor of the notion; others denied the existence of such an idea. Inada remained clear-cut in his own assertions. Everything done by the local Soviet forces, he insisted, must have been effected with the permission of Moscow; it was customary for the USSR not to abandon what it had once started. The Japanese Army never really thought that the Soviet Union would withdraw just as the result of diplomatic approaches. Therefore, from the outset, preparations were made to deal the Russians one decisive blow. Inada had recommended his plan, with its clear restrictions, to his colleagues and superiors; the scheme, he says, was approved 14 July “all the way up the chain of command, through the Army general staff and the ministry of war, with unexpected ease.”

The only real opposition, Inada recalled, came from the navy, whose staff advised the army operations staff, in all sincerity, to give up the idea of strategic reconnaissance. Inada adhered to his opinion stubbornly. He never forgot the grave look on the face of Captain Kusaka, the UN operations section chief, as the latter gave in reluctantly. The navy view was that the Changkufeng affair typified the army’s aggressive policies as opposed to relative passivity on the part of the navy. Like Kusaka, Japanese Navy interviewees shared the fear that Changkufeng might prove to be the most dangerous military confrontation ever to occur between the USSR and Japan. In view of navy objections, one wonders where Inada could have drawn support for his concept of reconnaissance in force. If one accepts the comments contained in a letter from a navy ministry captain, Takagi Sokichi, to Baron Harada Kumao at the beginning of August, in the army and in a portion of the navy there existed “shallow-minded fellows who are apt to take a firm stand in the blind belief that the USSR would not really rise against us, neglecting the fact that the Russians had foreseen our weak points.” Takagi also had violent things to say about “white-livered” Gaimusho elements that were playing up to the army.

Although Takagi’s remarks, expressed in confidence, were sharp, cautious injunctions were being delivered by the high command to the new Korea Army commander, General Nakamura Kotaro, who was about to leave for Seoul to replace Koiso. Nakamura’s attitude was crucial for the course and outcome of the Changkufeng Incident. More of a desk soldier than a warrior, he characteristic ally displayed a wariness that was reinforced by the guidance provided him. This personal quality assumes even greater significance if one believes that the Russians may have initiated the Changkufeng Incident by exploiting the special opportunities afforded them by the routine replacement of the Korea Army commander, the temporary absence from Moscow of Ambassador Shigemitsu Mamoru, and the geographical as well as subjective gap between the Kwantung and Korea armies that was exposed during the Lyushkov affair.

At 10:00 on 15 July Nakamura was designated army commander by the Emperor at the palace. Soon afterward, he was briefed by Imperial General headquarters officers. Hashimoto, the operations bureau chief, recalled that when he saw Nakamura off on 17 July, Hashimoto stressed prudence, limitation of any military action, and diplomatic solution of the problem. The new commanding general, Inada asserted, promised full cooperation. There was no mention, at this level, of Inada’s concept of reconnaissance in force. When Nakamura reached Seoul, he found an Imperial order from Tokyo dated 16 July awaiting him. This important document stipulated that he could concentrate units under his command in Korea near the border against the trespassing Soviet forces in the Changkufeng area. Resort to force, however, was dependent upon further orders. This message was followed by a wire from Kan’in, the Army general staff chief. The Imperial order, it was explained, had been designed to support diplomatic negotiations. Simultaneous approval was granted for concentrating forces to respond swiftly in case the situation deteriorated. As for implementation of the Imperial order, discretion should be exercised in line with the opinion expressed earlier by Korea Army Headquarters. Negotiations were to be conducted in Moscow and Harbin, the location of a Soviet consulate in Manchukuo. Meanwhile, the command was dispatching two officers for purposes of liaison: Lt. Colonel Arisue Yadoru in Operations and Major Kotani Etsuo a specialist in Soviet intelligence.

Inada advised Arisue that, apart from liaison flights inside the frontiers, particular care should be exercised with regard to actions that might lead to air combat. Nevertheless, although Inada stated that the Imperial order called for “a sort of military demonstration,” he admitted that it meant preparatory action for an attack. The Korea Army senior staff officer, Iwasaki, recalled hearing nothing about secret intentions. Nakamura briefed his staff about the need for restraint, especially during this key period of the Wuhan operation. Koiso had disposed of speculation that he had issued an order to concentrate the 19th Division before Nakamura arrived, although he and Nakamura did have the opportunity to confer in Seoul before he departed for Japan. The Imperial order of 16 July, in response to Koiso’s inquiry received in Tokyo on 14 July, had arrived in Seoul addressed to Nakamura; thereupon, the Korea Army chief of staff, Kitano, had the message conveyed to the division. By 21 July Koiso was back in Tokyo where, the day afterward, he advised the war minister, Itagaki, “to act prudently with respect to the Changkufeng problem.”

Why did the high command dispatch two field-grade liaison officers to Korea from the outset of the Changkufeng Incident? The Korea Army lacked operations staff. Its commander had been allotted prime responsibility, within the chain of command, for defense of northeastern Korea. At the beginning, the highest-ranking staff officer at the front was a major. Since there were no fundamental differences of opinion between the command and the forces in Korea, it was proper to send experts from Tokyo to assist. Imperial General headqaurters would observe the situation carefully, devise measures on the basis of the overall view, and issue orders which the Korea Army would implement through ordinary channels. It had not been the type of incident which required the army commander to go to the front to direct. This was the Korea Army’s first test, and political as well as diplomatic problems were involved that the army in the field should not or could not handle. If Tokyo had left decisions to the division and its regiments, the latter would have been held to account, which was not proper. Imperial General headquarters had to assume responsibility and reassure local commanders of its full support. Imaoka Yutaka explained that operational guidance by Imperial General headquarters and line operations conducted by the 19th Division formed the core of the affair; the Korea Army, placed between, was “shadowy.” Koiso had not been enthusiastic; this set the mood among the staff. Nakamura, who arrived with a thorough comprehension of AGS thinking, was basically passive. The Korea Army staff, in general, included no “wild boars.” 

 

There was an urgent need to monitor developments. Not only was the Korea Army unfamiliar with handling this type of incident, but many hitches occurred. There had been no practice in emergency transmission of coded wires between the Korea Army and Tokyo. Now telegram after telegram had to be sent; most were deciphered incorrectly and many were not decoded at all. Another problem centered on the lack of knowledge in Tokyo about the situation on the spot, which only visual observation could rectify. As a result, the two Army general staff experts, Arisue and Kotani, arrived in Korea on 16 July. Kotani recalled that he was to collect intelligence and assist the local authorities. One of the first duties that he and Arisue performed was to disseminate the principle that use of force required a prior Imperial order.

Also on 16 July, Japanese newspapers reported that the USSR was still concentrating troops, that the Manchukuoan government was watching intently, “decisive punitive measures” were being contemplated by the Japanese-Manchukuoan authorities, and there were signs of a worsening of the crisis. Despite good reasons for this gloomy appraisal, the Japanese press had not yet given the incident page-one treatment. More alarming news was being disseminated abroad. Domei, the official Japanese news agency, reported that the situation would probably become worse unless Soviet troops were withdrawn. The position of the Japanese government impressed foreign correspondents as unusually firm. Informants characterized the Changkufeng Incident as the most serious affair since the clash on the Amur River in 1937.

Irked by the Korea Army’s timidity and eager for first-hand information, the Kwantung Army dispatched two observers to the front: from Intelligence, Ogoshi Kenji, and from Operations, Tsuji Masanobu. If you listen to my pacific war week by week podcast or echoes of war, you know I highlight Tsuji Masanobu as one of the most evil Japanese officers of WW2. No other way to describe this guy, he was a shithead. In his memoirs, Tsuji asserted that he and Ogoshi climbed Changkufeng Hill, discerned Soviet soldiers digging across the peak in Manchurian territory, and concluded that “probably even Tokyo could not overlook such a clear-cut case of invasion.” Although his account aligned with the general thrust, Ogoshi contended that Tsuji could not have accompanied him. According to sources with the 19th Division, when Koiso learned that Tsuji and Ogoshi were disparaging the Korea Army’s ability to defend Changkufeng, he ordered “those spies” ousted. Ogoshi replied that the army staff was not angry, but Koiso did become furious and ordered Ogoshi “arrested for trespassing.” Ogoshi surmised that Koiso’s concern was that emotional outsiders such as Tsuji could provoke trouble, perhaps even war, if they visited Changkufeng. This view was widely shared. Inada stated that he made a practice of keeping away to maintain the degree of detachment and impartiality required of high command authorities.

One sidelight to the “fraternal” visit to the Changkufeng area by observers from Hsinking was provided by Lt. Colonel Katakura Tadashi, chief of the Kwantung Army’s 4th Section, which handled Manchukuo affairs, primarily political direction. When Katakura visited the Operations Section, Tsuji and Ogoshi told him that an intrusion had been confirmed and that the Kwantung Army staff was studying ways to evict the Soviets. Katakura consulted Maj. General Ishiwara Kanji, acting chief of staff, who was already in possession of the draft of an operations order calling for offensive preparations by the Kwantung Army against the Russians at Changkufeng. Katakura asked for reconsideration of the order. This was not a matter to be handled solely by the operations staff. Borders and international affairs were involved; hence the 4th Section, along with the Manchukuoan government, the Gaimusho, and other agencies, were concerned. Field observers were expressing exaggerated personal opinions based on having seen Soviet sentries on a hilltop. If the matter fell within the Korea Army’s defensive prerogative, that army ought to handle it. Apparently the Kwantung Army commander and Ishiwara agreed with Katakura, for the draft order was not approved. The so-called private message dispatched by a Kwantung Army staff officer just before Koiso’s departure may have been provoked by this rejection of direct participation by forces under Kwantung Army command.

Staff officers in Tokyo believed that Hsinking could not see the forest for the trees. In the high command’s view, the Kwantung Army’s deliberate escalation of a negligible frontier incident undoubtedly stemmed from a failure to grasp the strategic requirements of national defense—pursuit of the campaign in China, the nurturance of Manchukuo, and the buildup of operational readiness for the ultimate solution of the Soviet problem. The high command felt obliged to remind the Kwantung Army that, in dealing with the Changkufeng Incident, the central authorities pressed for a Russian pullback through diplomacy. Consequently, the Korea Army had been instructed to be ready to concentrate troops near Changkufeng as a “background.” Meanwhile, it remained the Imperial will that utmost prudence be exercised. The Kwantung Army commander accordingly issued cautious instructions to subordinate units, especially those on the eastern border. The high command’s injunctions did not end the discontent and recrimination at the lower levels of Kwantung Army Headquarters, nor did they quiet the concern felt in Tokyo. A former war minister told Baron Harada repeatedly in late July that the Kwantung Army was “no good,” while the superintendent of police added that the Kwantung Army was embarrassing Foreign Minister Ugaki. Nevertheless, the Kwantung Army did exert self-restraint.

For its part, the Korea Army naïvely sought to achieve entente with an antagonist who considered the case nonnegotiable. First, the government of Manchukuo was asked to lodge a formal protest with the USSR. The commissioner for foreign affairs at Harbin phoned V. V. Kuznetzov, the acting consul, on the night of 14 July and saw him on the 18th. Basing its contentions on maps, the Haensing regime demanded Soviet withdrawal from Changkufeng. The Japanese government was lodging similar protests within the framework of Japanese-Manchukuoan joint defense agreements. On the spot, the situation inflamed. During the afternoon of 15 July, a Japanese military police patrol from Korea reconnoitered at the foot of Hill 52, southeast of Changkufeng. The party came under Soviet gunfire and was driven back, abandoning the body of Corp. Matsushima Shakuni. Japanese sources claimed that a Russian ambush had been set inside Manchuria. The Russian side insisted that it was the Soviet frontier that had been violated by thirty meters. Kuzma Grebennik, the colonel commanding the 59th BGU, which covered the Posyet sector, asserted that Matsushima’s effects included a notebook containing reconnaissance results and a camera with film of Soviet-claimed terrain, particularly Changkufeng Hill. According to Maj. Gilfan Batarshin, a subordinate of Grebennik, two Russian border guards from Podgornaya opened fire when the Japanese fled after being challenged.

Japanese protests to the USSR about the death of Matsushima and the taking of his body were added to the negotiations concerning the disputed border and the alleged trespassing. Charge Nishi Haruhiko lodged a vigorous complaint in Moscow on 15 July but was answered by a counterprotest. Ambassador Shigemitsu underwent an identical experience during a conversation with Foreign Commissar Maxim Litvinov on 20 July. Shigemitsu retorted that the murder tended to exacerbate the negotiations. In his memoirs, he stated that the killing of Matsushima provoked the local Japanese border garrison unit. The shooting occurred as the Soviet military buildup continued, according to Japanese sources. Mechanized units were reported moving in the direction of Kyonghun from Barabash and Posyet Bay. Biplanes were reconnoitering the Hunchun Valley, within Manchurian territory, from the afternoon of 16 July. To the local Japanese authorities, it seemed that the Russians were adopting a challenging attitude. Although the Japanese-Manchukuoan side remained willing to negotiate—that is, to take no forceful actions if the Russians would withdraw, the latter appeared not to share such an intention. The Soviets were not only misinterpreting the Hunchun treaty to their advantage but were encroaching beyond what they claimed to be the line; they “lacked sincerity.” Decisive use of force might have been imperative to secure the Manchurian border, which was Japan’s legal responsibility. As far north as Tungning on the eastern Manchurian frontier, two Soviet ground divisions and considerable numbers of tanks and aircraft were reported massed in full view. At Changkufeng, Russian soldiers fortified the crest. Mountain guns were now seen with muzzles pointed toward Manchuria, and Japanese intelligence estimated that Soviet troop strength near Changkufeng had grown to 120 or 130 by the evening of 18 July. As Sawamoto Rikichiro, an Imperial aide, noted in his diary, “It would seem that settlement of the affair had become increasingly difficult.”

Korea Army staff officer Tsuchiya sent two emissaries bearing the notice to the Soviet border. The pair, “blazing with patriotic ardor,”set out on 18 July, carrying a message in one hand and a white flag in the other. From Kyonghun came the report the next day that there had been an urgent, well-attended Soviet staff meeting at BGU Headquarters in Novokievsk all night, and that the Russian side had been discomfited by the Japanese request, which had been transmitted to higher authorities. Still, the emissaries did not return, while a stream of reports indicated a Soviet buildup along a dozen frontier sectors. Russian authorities had reportedly forced the natives to evacuate an area twenty miles behind their borders. From Japanese observation posts, Soviet convoys of men, guns, and horses could be sighted moving toward Novokievsk after being unloaded from transports originating at Vladivostok. Japanese Army Intelligence reported that on 18 July a regimental-size force had arrived at Novokievsk; artillery displacements forward were particularly visible by night east of Khasan. A confidential Gaimusho message indicated that Soviet truck movements between Posyet, Novokievsk, and the front had increased since the 20th. Russian intrusions, kidnappings, and sniping incidents were reported along the Manchurian borders, from Manchouli on the west to Suifenho on the east, between 18 and 25 July. Aircraft on daytime reconnaissance were detected as far as three miles inside Manchurian territory in the Hunchun area. Although the Japanese asserted that their forbearance was being tested, Izvestiya charged “Japanese militarists” with manufacturing an affair at Ussuri as well as at Changkufeng. The Japanese themselves received reports from the Changkufeng front that by 20 July the Soviets had 250 soldiers, armed with field pieces, trench mortars, howitzers, and light and heavy machine guns, on the southern slopes. The Russians were putting up tents capable of holding 40 men each; officers could be observed for the first time. On the evening of the 20th, the Soviets lobbed illuminating shells toward Manchurian territory.

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Inada Masazum, studying maps and mud, saw Changkufeng Hill as a prize with peril, a test of nerve rather than a conquest. Tokyo’s orders pulsed through Seoul and Harbin: guard, probe, and deter, but avoid full-scale war. Across the border, Soviet units pressed closer, lights and tents flickering on the hillside. The sea within sight whispered of strategy, diplomacy, and a warning: a single misstep could redraw Asia. And so the standoff waited, patient as winter.