Show notes
Last time we spoke about the climax of the battle of Lake Khasan. In August, the Lake Khasan region became a tense theater of combat as Soviet and Japanese forces clashed around Changkufeng and Hill 52. The Soviets pushed a multi-front offensive, bolstered by artillery, tanks, and air power, yet the Japanese defenders held firm, aided by engineers, machine guns, and heavy guns. By the ninth and tenth, a stubborn Japanese resilience kept Hill 52 and Changkufeng in Japanese hands, though the price was steep and the field was littered with the costs of battle. Diplomatically, both sides aimed to confine the fighting and avoid a larger war. Negotiations trudged on, culminating in a tentative cease-fire draft for August eleventh: a halt to hostilities, positions to be held as of midnight on the tenth, and the creation of a border-demarcation commission. Moscow pressed for a neutral umpire; Tokyo resisted, accepting a Japanese participant but rejecting a neutral referee. The cease-fire was imperfect, with miscommunications and differing interpretations persisting. #185 Operation Hainan 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. After what seemed like a lifetime over in the northern border between the USSR and Japan, today we are returning to the Second Sino-Japanese War. Now I thought it might be a bit jarring to dive into it, so let me do a brief summary of where we are at, in the year of 1939. As the calendar turned to 1939, the Second Sino-Japanese War, which had erupted in July 1937 with the Marco Polo Bridge Incident and escalated into full-scale conflict, had evolved into a protracted quagmire for the Empire of Japan. What began as a swift campaign to subjugate the Republic of China under Chiang Kai-shek had, by the close of 1938, transformed into a war of attrition. Japanese forces, under the command of generals like Shunroku Hata and Yasuji Okamura, had achieved stunning territorial gains: the fall of Shanghai in November 1937 after a brutal three-month battle that cost over 200,000 Chinese lives; the infamous capture of Nanjing in December 1937, marked by the Nanjing Massacre where an estimated 300,000 civilians and disarmed soldiers were killed in a six-week orgy of violence; and the sequential occupations of Xuzhou in May 1938, Wuhan in October 1938, and Guangzhou that same month. These victories secured Japan's control over China's eastern seaboard, major riverine arteries like the Yangtze, and key industrial centers, effectively stripping the Nationalists of much of their economic base. Yet, despite these advances, China refused to capitulate. Chiang's government had retreated inland to the mountainous stronghold of Chongqing in Sichuan province, where it regrouped amid the fog-laden gorges, drawing on the vast human reserves of China's interior and the resilient spirit of its people. By late 1938, Japanese casualties had mounted to approximately 50,000 killed and 200,000 wounded annually, straining the Imperial Japanese Army's resources and exposing the vulnerabilities of overextended supply lines deep into hostile territory. In Tokyo, the corridors of the Imperial General Headquarters and the Army Ministry buzzed with urgent deliberations during the winter of 1938-1939. The initial doctrine of "quick victory" through decisive battles, epitomized by the massive offensives of 1937 and 1938, had proven illusory. Japan's military planners, influenced by the Kwantung Army's experiences in Manchuria and the ongoing stalemate, recognized that China's sheer size, with its 4 million square miles and over 400 million inhabitants, rendered total conquest unfeasible without unacceptable costs. Intelligence reports highlighted the persistence of Chinese guerrilla warfare, particularly in the north where Communist forces under Mao Zedong's Eighth Route Army conducted hit-and-run operations from bases in Shanxi and Shaanxi, sabotaging railways and ambushing convoys. The Japanese response included brutal pacification campaigns, such as the early iterations of what would later formalize as the "Three Alls Policy" (kill all, burn all, loot all), aimed at devastating rural economies and isolating resistance pockets. But these measures only fueled further defiance. By early 1939, a strategic pivot was formalized: away from direct annihilation of Chinese armies toward a policy of economic strangulation. This "blockade and interdiction" approach sought to sever China's lifelines to external aid, choking off the flow of weapons, fuel, and materiel that sustained the Nationalist war effort. As one Japanese staff officer noted in internal memos, the goal was to "starve the dragon in its lair," acknowledging the limits of Japanese manpower, total forces in China numbered around 1 million by 1939, against China's inexhaustible reserves. Central to this new strategy were the three primary overland supply corridors that had emerged as China's backdoors to the world, compensating for the Japanese naval blockade that had sealed off most coastal ports since late 1937. The first and most iconic was the Burma Road, a 717-mile engineering marvel hastily constructed between 1937 and 1938 by over 200,000 Chinese and Burmese laborers under the direction of engineers like Chih-Ping Chen. Stretching from the railhead at Lashio in British Burma (modern Myanmar) through treacherous mountain passes and dense jungles to Kunming in Yunnan province, the road navigated elevations up to 7,000 feet with hundreds of hairpin turns and precarious bridges. By early 1939, it was operational, albeit plagued by monsoonal mudslides, banditry, and mechanical breakdowns of the imported trucks, many Ford and Chevrolet models supplied via British Rangoon. Despite these challenges, it funneled an increasing volume of aid: in 1939 alone, estimates suggest up to 10,000 tons per month of munitions, gasoline, and aircraft parts from Allied sources, including early Lend-Lease precursors from the United States. The road's completion in 1938 had been a direct response to the loss of southern ports, and its vulnerability to aerial interdiction made it a prime target in Japanese planning documents. The second lifeline was the Indochina route, centered on the French-built Yunnan-Vietnam Railway (also known as the Hanoi-Kunming Railway), a 465-mile narrow-gauge line completed in 1910 that linked the port of Haiphong in French Indochina to Kunming via Hanoi and Lao Cai. This colonial artery, supplemented by parallel roads and river transport along the Red River, became China's most efficient supply conduit in 1938-1939, exploiting France's uneasy neutrality. French authorities, under Governor-General Pierre Pasquier and later Georges Catroux, turned a blind eye to transshipments, allowing an average of 15,000 to 20,000 tons monthly in early 1939, far surpassing the Burma Road's initial capacity. Cargoes included Soviet arms rerouted via Vladivostok and American oil, with French complicity driven by anti-Japanese sentiment and profitable tolls. However, Japanese reconnaissance flights from bases in Guangdong noted the vulnerability of bridges and rail yards, leading to initial bombing raids by mid-1939. Diplomatic pressure mounted, with Tokyo issuing protests to Paris, foreshadowing the 1940 closure under Vichy France after the fall of France in Europe. The route's proximity to the South China Sea made it a focal point for Japanese naval strategists, who viewed it as a "leak in the blockade." The third corridor, often overlooked but critical, was the Northwest Highway through Soviet Central Asia and Xinjiang province. This overland network, upgraded between 1937 and 1941 with Soviet assistance, connected the Turkestan-Siberian Railway at Almaty (then Alma-Ata) to Lanzhou in Gansu via Urumqi, utilizing a mix of trucks, camel caravans, and rudimentary roads across the Gobi Desert and Tian Shan mountains. Under the Sino-Soviet Non-Aggression Pact of August 1937 and subsequent aid agreements, Moscow supplied China with over 900 aircraft, 82 tanks, 1,300 artillery pieces, and vast quantities of ammunition and fuel between 1937 and 1941—much of it traversing this route. In 1938-1939, volumes peaked, with Soviet pilots and advisors even establishing air bases in Lanzhou. The highway's construction involved tens of thousands of Chinese laborers, facing harsh winters and logistical hurdles, but it delivered up to 2,000 tons monthly, including entire fighter squadrons like the Polikarpov I-16. Japanese intelligence, aware of this "Red lifeline," planned disruptions but were constrained by the ongoing Nomonhan Incident on the Manchurian-Soviet border in 1939, which diverted resources and highlighted the risks of provoking Moscow. These routes collectively sustained China's resistance, prompting Japan's high command to prioritize their severance. In March 1939, the South China Area Army was established under General Rikichi Andō (later succeeded by Field Marshal Hisaichi Terauchi), headquartered in Guangzhou, with explicit orders to disrupt southern communications. Aerial campaigns intensified, with Mitsubishi G3M "Nell" bombers from Wuhan and Guangzhou targeting Kunming's airfields and the Red River bridges, while diplomatic maneuvers pressured colonial powers: Britain faced demands during the June 1939 Tientsin Crisis to close the Burma Road, and France received ultimatums that culminated in the 1940 occupation of northern Indochina. Yet, direct assaults on Yunnan or Guangxi were deemed too arduous due to rugged terrain and disease risks. Instead, planners eyed peripheral objectives to encircle these arteries. This strategic calculus set the stage for the invasion of Hainan Island, a 13,000-square-mile landmass off Guangdong's southern coast, rich in iron and copper but strategically priceless for its position astride the Indochina route and proximity to Hong Kong. By February 1939, Japanese admirals like Nobutake Kondō of the 5th Fleet advocated seizure to establish air and naval bases, plugging blockade gaps and enabling raids on Haiphong and Kunming, a prelude to broader southern expansion that would echo into the Pacific War. Now after the fall campaign around Canton in autumn 1938, the Japanese 21st Army found itself embedded in a relentless effort to sever the enemy's lifelines. Its primary objective shifted from mere battlefield engagements to tightening the choke points of enemy supply, especially along the Canton–Hankou railway. Recognizing that war materiel continued to flow into the enemy's hands, the Imperial General Headquarters ordered the 21st Army to strike at every other supply route, one by one, until the arteries of logistics were stifled. The 21st Army undertook a series of decisive occupations to disrupt transport and provisioning from multiple directions. To sustain these difficult campaigns, Imperial General Headquarters reinforced the south China command, enabling greater operational depth and endurance. The 21st Army benefited from a series of reinforcements during 1939, which allowed a reorganization of assignments and missions: In late January, the Iida Detachment was reorganized into the Formosa Mixed Brigade and took part in the invasion of Hainan Island. Hainan, just 15 miles across the Qiongzhou Strait from the mainland, represented a critical "loophole": it lay astride the Gulf of Tonkin, enabling smuggling of arms and materiel from Haiphong to Kunming, and offered potential airfields for bombing raids deep into Yunnan. Japanese interest in Hainan dated to the 1920s, driven by the Taiwan Governor-General's Office, which eyed the island's tropical resources (rubber, iron, copper) and naval potential at ports like Sanya (Samah). Prewar surveys by Japanese firms, such as those documented in Ide Kiwata's Minami Shina no Sangyō to Keizai (1939), highlighted mineral wealth and strategic harbors. The fall of Guangzhou in October 1938 provided the perfect launchpad, but direct invasion was delayed until early 1939 amid debates between the IJA (favoring mainland advances) and IJN (prioritizing naval encirclement). The operation would also heavily align with broader "southward advance" (Nanshin-ron) doctrine foreshadowing invasions of French Indochina (1940) and the Pacific War. On the Chinese side, Hainan was lightly defended as part of Guangdong's "peace preservation" under General Yu Hanmou. Two security regiments, six guard battalions, and a self-defense corps, totaling around 7,000–10,000 poorly equipped troops guarded the island, supplemented by roughly 300 Communist guerrillas under Feng Baiju, who operated independently in the interior. The indigenous Li (Hlai) people in the mountainous south, alienated by Nationalist taxes, provided uneven support but later allied with Communists. The Imperial General Headquarters ordered the 21st Army, in cooperation with the Navy, to occupy and hold strategic points on the island near Haikou-Shih. The 21st Army commander assigned the Formosa Mixed Brigade to carry out this mission. Planning began in late 1938 under the IJN's Fifth Fleet, with IJA support from the 21st Army. The objective: secure northern and southern landing sites to bisect the island, establish air/naval bases, and exploit resources. Vice Admiral Nobutake Kondō, commanding the fleet, emphasized surprise and air superiority. The invasion began under the cover of darkness on February 9, 1939, when Kondō's convoy entered Tsinghai Bay on the northern shore of Hainan and anchored at midnight. Japanese troops swiftly disembarked, encountering minimal initial resistance from the surprised Chinese defenders, and secured a beachhead in the northern zone. At 0300 hours on 10 February, the Formosa Mixed Brigade, operating in close cooperation with naval units, executed a surprise landing at the northeastern point of Tengmai Bay in north Hainan. By 04:30, the right flank reached the main road leading to Fengyingshih, while the left flank reached a position two kilometers south of Tienwei. By 07:00, the right flank unit had overcome light enemy resistance near Yehli and occupied Chiungshan. At that moment there were approximately 1,000 elements of the enemy's 5th Infantry Brigade (militia) at Chiungshan; about half of these troops were destroyed, and the remainder fled into the hills south of Tengmai in a state of disarray. Around 08:30 that same day, the left flank unit advanced to the vicinity of Shuchang and seized Hsiuying Heights. By 12:00, it occupied Haikou, the island's northern port city and administrative center, beginning around noon. Army and navy forces coordinated to mop up remaining pockets of resistance in the northern areas, overwhelming the scattered Chinese security units through superior firepower and organization. No large-scale battles are recorded in primary accounts; instead, the engagements were characterized by rapid advances and localized skirmishes, as the Chinese forces, lacking heavy artillery or air support, could not mount a sustained defense. By the end of the day, Japanese control over the north was consolidating, with Haikou falling under their occupation.Also on 10 February, the Brigade pushed forward to seize Cingang. Wenchang would be taken on the 22nd, followed by Chinglan Port on the 23rd. On February 11, the operation expanded southward when land combat units amphibiously assaulted Samah (now Sanya) at the island's southern tip. This landing allowed them to quickly seize key positions, including the port of Yulin (Yulinkang) and the town of Yai-Hsien (Yaxian, now part of Sanya). With these southern footholds secured, Japanese forces fanned out to subjugate the rest of the island, capturing inland areas and infrastructure with little organized opposition. Meanwhile, the landing party of the South China Navy Expeditionary Force, which had joined with the Army to secure Haikou, began landing on the island's southern shore at dawn on 14 February. They operated under the protection of naval and air units. By the same morning, the landing force had advanced to Sa-Riya and, by 12:00 hours, had captured Yulin Port. Chinese casualties were significant in the brief fighting; from January to May 1939, reports indicate the 11th security regiment alone suffered 8 officers and 162 soldiers killed, 3 officers and 16 wounded, and 5 officers and 68 missing, though figures for other units are unclear. Japanese losses were not publicly detailed but appear to have been light. When crisis pressed upon them, Nationalist forces withdrew from coastal Haikou, shepherding the last civilians toward the sheltering embrace of the Wuzhi mountain range that bands the central spine of Hainan. From that high ground they sought to endure the storm, praying that the rugged hills might shield their families from the reach of war. Yet the Li country's mountains did not deliver a sanctuary free of conflict. Later in August of 1943, an uprising erupted among the Li,Wang Guoxing, a figure of local authority and stubborn resolve. His rebellion was swiftly crushed; in reprisal, the Nationalists executed a seizure of vengeance that extended far beyond the moment of defeat, claiming seven thousand members of Wang Guoxing's kin in his village. The episode was grim testimony to the brutal calculus of war, where retaliation and fear indelibly etched the landscape of family histories. Against this backdrop, the Communists under Feng Baiju and the native Li communities forged a vigorous guerrilla war against the occupiers. The struggle was not confined to partisan skirmishes alone; it unfolded as a broader contest of survival and resistance. The Japanese response was relentless and punitive, and it fell upon Li communities in western Hainan with particular ferocity, Sanya and Danzhou bore the brunt of violence, as did the many foreign laborers conscripted into service by the occupying power. The toll of these reprisals was stark: among hundreds of thousands of slave laborers pressed into service, tens of thousands perished. Of the 100,000 laborers drawn from Hong Kong, only about 20,000 survived the war's trials, a haunting reminder of the human cost embedded in the occupation. Strategically, the island of Hainan took on a new if coercive purpose. Portions of the island were designated as a naval administrative district, with the Hainan Guard District Headquarters established at Samah, signaling its role as a forward air base and as an operational flank for broader anti-Chiang Kai-shek efforts. In parallel, the island's rich iron and copper resources were exploited to sustain the war economy of the occupiers. The control of certain areas on Hainan provided a base of operations for incursions into Guangdong and French Indochina, while the airbases that dotted the island enabled long-range air raids that threaded routes from French Indochina and Burma into the heart of China. The island thus assumed a grim dual character: a frontier fortress for the occupiers and a ground for the prolonged suffering of its inhabitants. Hainan then served as a launchpad for later incursions into Guangdong and Indochina. Meanwhile after Wuhan's collapse, the Nationalist government's frontline strength remained formidable, even as attrition gnawed at its edges. By the winter of 1938–1939, the front line had swelled to 261 divisions of infantry and cavalry, complemented by 50 independent brigades. Yet the political and military fissures within the Kuomintang suggested fragility beneath the apparent depth of manpower. The most conspicuous rupture came with Wang Jingwei's defection, the vice president and chairman of the National Political Council, who fled to Hanoi on December 18, 1938, leading a procession of more than ten other KMT officials, including Chen Gongbo, Zhou Fohai, Chu Minqi, and Zeng Zhongming. In the harsh arithmetic of war, defections could not erase the country's common resolve to resist Japanese aggression, and the anti-Japanese national united front still served as a powerful instrument, rallying the Chinese populace to "face the national crisis together." Amid this political drama, Japan's strategy moved into a phase that sought to convert battlefield endurance into political consolidation. As early as January 11, 1938, Tokyo had convened an Imperial Conference and issued a framework for handling the China Incident that would shape the theater for years. The "Outline of Army Operations Guidance" and "Continental Order No. 241" designated the occupied territories as strategic assets to be held with minimal expansion beyond essential needs. The instruction mapped an operational zone that compressed action to a corridor between Anqing, Xinyang, Yuezhou, and Nanchang, while the broader line of occupation east of a line tracing West Sunit, Baotou, and the major river basins would be treated as pacified space. This was a doctrine of attrition, patience, and selective pressure—enough to hold ground, deny resources to the Chinese, and await a more opportune political rupture. Yet even as Japan sought political attrition, the war's tactical center of gravity drifted toward consolidation around Wuhan and the pathways that fed the Yangtze. In October 1938, after reducing Wuhan to a fortressed crescent of contested ground, the Japanese General Headquarters acknowledged the imperative to adapt to a protracted war. The new calculus prioritized political strategy alongside military operations: "We should attach importance to the offensive of political strategy, cultivate and strengthen the new regime, and make the National Government decline, which will be effective." If the National Government trembled under coercive pressure, it risked collapse, and if not immediately, then gradually through a staged series of operations. In practice, this meant reinforcing a centralized center while allowing peripheral fronts to be leveraged against Chongqing's grip on the war's moral economy. In the immediate post-Wuhan period, Japan divided its responsibilities and aimed at a standoff that would enable future offensives. The 11th Army Group, stationed in the Wuhan theater, became the spearhead of field attacks on China's interior, occupying a strategic triangle that included Hunan, Jiangxi, and Guangxi, and protecting the rear of southwest China's line of defense. The central objective was not merely to seize territory, but to deny Chinese forces the capacity to maneuver along the critical rail and river corridors that fed the Nanjing–Jiujiang line and the Zhejiang–Jiangxi Railway. Central to this plan was Wuhan's security and the ability to constrain Jiujiang's access to the Yangtze, preserving a corridor for air power and logistics. The pre-war arrangement in early 1939 was a tableau of layered defenses and multiple war zones, designed to anticipate and blunt Japanese maneuver. By February 1939, the Ninth War Zone under Xue Yue stood in a tense standoff with the Japanese 11th Army along the Jiangxi and Hubei front south of the Yangtze. The Ninth War Zone's order of battle, Luo Zhuoying's 19th Army Group defending the northern Nanchang front, Wang Lingji's 30th Army Group near Wuning, Fan Songfu's 8th and 73rd Armies along Henglu, Tang Enbo's 31st Army Group guarding southern Hubei and northern Hunan, and Lu Han's 1st Army Group in reserve near Changsha and Liuyang, was a carefully calibrated attempt to absorb, delay, and disrupt any Xiushui major Japanese thrust toward Nanchang, a city whose strategic significance stretched beyond its own bounds. In the spring of 1939, Nanchang was the one city in southern China that Tokyo could not leave in Chinese hands. It was not simply another provincial capital; it was the beating heart of whatever remained of China's war effort south of the Yangtze, and the Japanese knew it. High above the Gan River, on the flat plains west of Poyang Lake, lay three of the finest airfields China had ever built: Qingyunpu, Daxiaochang, and Xiangtang. Constructed only a few years earlier with Soviet engineers and American loans, they were long, hard-surfaced, and ringed with hangars and fuel dumps. Here the Chinese Air Force had pulled back after the fall of Wuhan, and here the red-starred fighters and bombers of the Soviet volunteer groups still flew. From Nanchang's runways a determined pilot could reach Japanese-held Wuhan in twenty minutes, Guangzhou in less than an hour, and even strike the docks at Hong Kong if he pushed his range. Every week Japanese reconnaissance planes returned with photographs of fresh craters patched, new aircraft parked wing-to-wing, and Soviet pilots sunning themselves beside their I-16s. As long as those fields remained Chinese, Japan could never claim the sky. The city was more than airfields. It sat exactly where the Zhejiang–Jiangxi Railway met the line running north to Jiujiang and the Yangtze, a knot that tied together three provinces. Barges crowded Poyang Lake's western shore, unloading crates of Soviet ammunition and aviation fuel that had come up the river from the Indochina railway. Warehouses along the tracks bulged with shells and rice. To the Japanese staff officers plotting in Wuhan and Guangzhou, Nanchang looked less like a city and more like a loaded spring: if Chiang Kai-shek ever found the strength for a counteroffensive to retake the middle Yangtze, this would be the place from which it would leap. And so, in the cold March of 1939, the Imperial General Headquarters marked Nanchang in red on every map and gave General Okamura the order he had been waiting for: take it, whatever the cost. Capturing the city would do three things at once. It would blind the Chinese Air Force in the south by seizing or destroying the only bases from which it could still seriously operate. It would tear a hole in the last east–west rail line still feeding Free China. And it would shove the Nationalist armies another two hundred kilometers farther into the interior, buying Japan precious time to digest its earlier conquests and tighten the blockade. Above all, Nanchang was the final piece in a great aerial ring Japan was closing around southern China. Hainan had fallen in February, giving the navy its southern airfields. Wuhan and Guangzhou already belonged to the army. Once Nanchang was taken, Japanese aircraft would sit on a continuous arc of bases from the tropical beaches of the South China Sea to the banks of the Yangtze, and nothing (neither the Burma Road convoys nor the French railway from Hanoi) would move without their permission. Chiang Kai-shek's decision to strike first in the Nanchang region in March 1939 reflected both urgency and a desire to seize initiative before Japanese modernization of the battlefield could fully consolidate. On March 8, Chiang directed Xue Yue to prepare a preemptive attack intended to seize the offensive by March 15, focusing the Ninth War Zone's efforts on preventing a river-crossing assault and pinning Japanese forces in place. The plan called for a sequence of coordinated actions: the 19th Army Group to hold the northern front of Nanchang; the Hunan-Hubei-Jiangxi Border Advance Army (the 8th and 73rd Armies) to strike the enemy's left flank from Wuning toward De'an and Ruichang; the 30th and 27th Army Groups to consolidate near Wuning; and the 1st Army Group to push toward Xiushui and Sandu, opening routes for subsequent operations. Yet even as Xue Yue pressed for action, the weather of logistics and training reminded observers that no victory could be taken for granted. By March 9–10, Xue Yue warned Chiang that troops were not adequately trained, supplies were scarce, and preparations were insufficient, requesting a postponement to March 24. Chiang's reply was resolute: the attack must commence no later than the 24th, for the aim was preemption and the desire to tether the enemy's forces before they could consolidate. When the moment of decision arrived, the Chinese army began to tense, and the Japanese, no strangers to rapid shifts in tempo—moved to exploit any hesitation or fog of mobilization. The Ninth War Zone's response crystallized into a defensive posture as the Japanese pressed forward, marking a transition from preemption to standoff as both sides tested the limits of resilience. The Japanese plan for what would become known as Operation Ren, aimed at severing the Zhejiang–Jiangxi Railway, breaking the enemy's line of communication, and isolating Nanchang, reflected a calculated synthesis of air power, armored mobility, and canalized ground offensives. On February 6, 1939, the Central China Expeditionary Army issued a set of precise directives: capture Nanchang to cut the Zhejiang–Jiangxi Railway and disrupt the southern reach of Anhui and Zhejiang provinces; seize Nanchang along the Nanchang–Xunyi axis to split enemy lines and "crush" Chinese resistance south of that zone; secure rear lines immediately after the city's fall; coordinate with naval air support to threaten Chinese logistics and airfields beyond the rear lines. The plan anticipated contingencies by pre-positioning heavy artillery and tanks in formations that could strike with speed and depth, a tactical evolution from previous frontal assaults. Okamura Yasuji, commander of the 11th Army, undertook a comprehensive program of reconnaissance, refining the assault plan with a renewed emphasis on speed and surprise. Aerial reconnaissance underlined the terrain, fortifications, and the disposition of Chinese forces, informing the selection of the Xiushui River crossing and the route of the main axis of attack. Okamura's decision to reorganize artillery and armor into concentrated tank groups, flanked by air support and advanced by long-range maneuver, marked a departure from the earlier method of distributing heavy weapons along the infantry front. Sumita Laishiro commanded the 6th Field Heavy Artillery Brigade, with more than 300 artillery pieces, while Hirokichi Ishii directed a force of 135 tanks and armored vehicles. This blended arms approach promised a breakthrough that would outpace the Chinese defenders and open routes for the main force. By mid-February 1939, Japanese preparations had taken on a high tempo. The 101st and 106th Divisions, along with attached artillery, assembled south of De'an, while tank contingents gathered north of De'an. The 6th Division began moving toward Ruoxi and Wuning, the Inoue Detachment took aim at the waterways of Poyang Lake, and the 16th and 9th Divisions conducted feints on the Han River's left bank. The orchestration of these movements—feints, riverine actions, and armored flanking, was designed to reduce the Chinese capacity to concentrate forces around Nanchang and to force the defenders into a less secure posture along the Nanchang–Jiujiang axis. Japan's southward strategy reframed the war: no longer a sprint to reduce Chinese forces in open fields, but a patient siege of lifelines, railways, and airbases. Hainan's seizure, the control of Nanchang's airfields, and the disruption of the Zhejiang–Jiangxi Railway exemplified a shift from large-scale battles to coercive pressure that sought to cripple Nationalist mobilization and erode Chongqing's capacity to sustain resistance. For China, the spring of 1939 underscored resilience amid mounting attrition. Chiang Kai-shek's insistence on offensive means to seize the initiative demonstrated strategic audacity, even as shortages and uneven training slowed tempo. The Ninth War Zone's defense, bolstered by makeshift airpower from Soviet and Allied lendings, kept open critical corridors and delayed Japan's consolidation. The war's human cost—massive casualties, forced labor, and the Li uprising on Hainan—illuminates the brutality that fueled both sides' resolve. In retrospect, the period around Canton, Wuhan, and Nanchang crystallizes a grim truth: the Sino-Japanese war was less a single crescendo of battles than a protracted contest of endurance, logistics, and political stamina. The early 1940s would widen these fault lines, but the groundwork laid in 1939, competition over supply routes, air control, and strategic rail nodes, would shape the war's pace and, ultimately, its outcome. The conflict's memory lies not only in the clashes' flash but in the stubborn persistence of a nation fighting to outlast a formidable adversary. I would like to take this time to remind you all that this podcast is only made possible through the efforts of Kings and Generals over at Youtube. Please go 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 after that, give my personal channel a look over at The Pacific War Channel at Youtube, it would mean a lot to me. The Japanese invasion of Hainan and proceeding operations to stop logistical leaks into Nationalist China, showcased the complexity and scale of the growing Second Sino-Japanese War. It would not merely be a war of territorial conquest, Japan would have to strangle the colossus using every means necessary.