The Warlord Descends: Hideyoshi’s 1587 Kyūshū Campaign

Chapter One

The Supplicant

In the spring of 1586, an old man arrived in Ōsaka. He had travelled hundreds of miles from the southern island of Kyūshū, through territory controlled by warlords who owed him nothing, to throw himself at the feet of a man he had never met. The old man was Ōtomo Sōrin, once the most powerful lord in northern Kyūshū, ruler of six or seven provinces, patron of Jesuit missionaries, and a baptised Christian who had taken the name Francisco. He was sixty years old, sick, and running out of time. The Shimazu army was burning its way through his last remaining province, and every vassal he had ever trusted had either defected or died.

The man he came to see was Toyotomi Hideyoshi, the former sandal-bearer who had clawed his way from peasant obscurity to become the kampaku, the imperial regent and de facto ruler of Japan. Hideyoshi listened to the old Christian lord’s plea, and what he heard was not a sob story. It was an invitation. Kyūshū, the last major island outside his control, was tearing itself apart. Its three great clans had spent a decade destroying each other, and the winner, the Shimazu of Satsuma, had just refused a direct order from Hideyoshi to stop fighting and accept his arbitration.

Nobody refused Hideyoshi and kept their head. The kampaku began assembling the largest army Japan had ever seen.

Chapter Two

Three Clans and a Knife Fight

To understand why a quarter of a million men marched south in 1587, you have to understand the extraordinarily violent game of musical chairs that Kyūshū’s warlords had been playing for the previous decade. The island in the 1570s was dominated by three great houses, the Ōtomo in the north, the Ryūzōji in the northwest, and the Shimazu in the south, and every one of them was convinced it was going to eat the other two for breakfast.

The Ōtomo, under Sōrin, had the largest domain on paper: six or seven provinces radiating outward from their home base of Bungo on the eastern coast. This looked formidable on a map. In practice, the Ōtomo realm was a medieval coalition held together with good intentions. Sōrin had never managed to establish the kind of centralised control that separated a genuinely powerful daimyō from a lord whose vassals tolerated him. Collateral families like the Shiga and Tawara maintained their own agendas. Supposedly subordinate lords in Higo, the Asō, the Kikuchi, operated as independent warlords who happened to send Sōrin polite letters.

The whole fragile structure came apart in 1578, when Sōrin made the fateful decision to march south. The Shimazu had just expelled the allied Itō clan from Hyūga province, and Sōrin, in a fit of strategic ambition that outran his logistics, sent somewhere between 40,000 and 60,000 men to stop them. The result was the Battle of Mimigawa, one of the most catastrophic defeats in Sengoku-era warfare. The Shimazu annihilated the Ōtomo army. The vassals who had been quietly questioning Sōrin’s leadership now had their answer. Across Chikuzen and Chikugo, men like Akizuki Tanezane and Tsukushi Hirokado defected or rebelled openly. The Ōtomo domain did not so much collapse as evaporate.

Into the vacuum rushed the Ryūzōji, led by a man whose name alone, Takanobu, “the Bear”, gives you the general idea. The Ryūzōji were classic gekokujō warlords, the low overthrowing the high, having risen to power by the simple expedient of destroying their former overlords, the Shōni family, and seizing control of Hizen Province. Takanobu was ruthless, effective, and spectacularly aggressive. By the early 1580s, he had bullied into submission practically every minor lord on Kyūshū’s western seaboard, the Matsuura, the Omura, the Arima, Christian daimyō who depended on Portuguese trade and Jesuit connections to survive.

This was a mistake. Takanobu’s relentless expansion pushed his desperate neighbours directly into the arms of the Shimazu. In 1584, at the Battle of Okidanawate on the Shimabara peninsula, a combined Shimazu-Arima force met Takanobu’s much larger army and destroyed it. Takanobu himself was killed. His clan’s domain collapsed overnight, and the carefully constructed Ryūzōji hegemony over western Kyūshū vanished as quickly as it had been assembled.

Which left the Shimazu.

Chapter Three

The Men from the South

The Shimazu of Satsuma were not newcomers. Their lineage stretched back to the Kamakura period, making them one of the oldest warrior houses in Japan, a pedigree they were happy to remind everyone about, frequently and at length. Under the leadership of Shimazu Yoshihisa and his three formidable brothers, Yoshihiro, Toshihisa, and Iehisa, the clan had spent the mid-sixteenth century doing what all successful Sengoku warlords did: consolidating their home base through a combination of strategic marriage, tactical brilliance, and the liberal application of violence to anyone who disagreed.

By 1577, they had subjugated the rebellious barons of Ōsumi and conquered Hyūga Province. After Mimigawa shattered the Ōtomo and Okidanawate killed the Ryūzōji, the Shimazu launched a campaign of breathtaking ambition: the total unification of Kyūshū under their banner. By 1586, their armies had pushed through Higo, Chikuzen, and Buzen, and were pouring into Bungo itself, Sōrin’s last province, the Ōtomo heartland.

This is the moment when Sōrin got on the road to Ōsaka.

Hideyoshi, newly minted as kampaku, sent a messenger to Yoshihisa with a straightforward proposition: stop fighting, accept my authority, and we can discuss terms. Yoshihisa’s response was essentially that he had been fighting for decades, he was winning, and he saw no reason to submit to a man whose grandfather had been a peasant. The Shimazu were an ancient house. Hideyoshi was a parvenu. The answer was no.

Chapter Four

The Army That Emptied Japan

Hideyoshi’s response to the Shimazu refusal was not subtle. He ordered a general mobilisation across essentially every domain in central and western Japan. 77 daimyō received their marching orders. When the levies were tallied, the expeditionary force numbered somewhere between 200,000 and 250,000 men. Some contemporary accounts put it as high as 300,000, which may be inflated but captures the power that Hideyoshi intended to project. This was not an army assembled to fight a war. It was an army assembled to make fighting unnecessary.

The logistics were as impressive as the numbers. Hideyoshi’s staff organised supply lines sufficient to keep the army fed for at least a year of campaigning. Rice, miso, dried fish, horse fodder, the bureaucratic machinery of Toyotomi Japan cranked into gear, and the result was a rolling logistical operation that moved provisions across hundreds of miles of mountainous terrain and then across the Strait of Shimonoseki to the staging areas on Kyūshū’s northern coast.

The vanguard crossed the strait in late autumn of 1586, led by generals from the Mōri clan, Kobayakawa Takakage and Kikkawa Motoharu, old western campaigners who knew the Kyūshū terrain. They secured a beachhead by taking the Shimazu fort at Kokura in November. Then things went wrong.

An advance allied force, made up of troops from Chōsokabe Motochika, Sengoku Hidehisa, and Ōtomo Yoshimune (Sōrin’s son), pushed ahead into Bungo, where the Shimazu were still operating in strength. At the Battle of Hetsugigawa in January 1587, the Shimazu lured this forward force into a trap and destroyed it. It was a sharp, humiliating reminder that the men from Satsuma were among the finest soldiers in Japan, and that an army’s size means nothing if its components are poorly coordinated.

Hideyoshi absorbed the lesson. When the main invasion launched in April 1587, there would be no improvisation.

Chapter Five

The Hammer Falls

The full invasion was conceived as a pincer movement of overwhelming force. Two massive columns would advance down opposite coasts of Kyūshū, converging on the Shimazu heartland from both directions simultaneously.

Hideyoshi personally commanded the western column, departing Ōsaka in April and marching his army down through Chikuzen, Chikugo, and Higo before driving into Satsuma from the west. His half-brother, Hashiba Hidenaga, a capable and underappreciated general, led the eastern column through Bungo and Hyūga, aiming to strike the Shimazu from behind.

The Shimazu, whatever else might be said about them, were not fools. Yoshihisa looked at the forces arrayed against him, did the arithmetic, and made the only rational decision available: he pulled his troops out of northern Kyūshū entirely. The garrisons that had been occupying Bungo, Chikuzen, and Buzen retreated south along their original invasion routes, falling back toward the home provinces of Satsuma and Ōsumi. Fighting in the north against those numbers would have been suicide, and the Shimazu preferred to make their stand on familiar ground.

The result was that Hideyoshi’s march down the western coast met almost no resistance. It was less a military campaign than a triumphal procession. Local warlords who had been fighting for the Shimazu six months earlier performed rapid mental recalibrations and rushed to submit to the new order. The Akizuki, the Ryūzōji remnant, the Matsuura, the Arima, they all came in, bowed, and declared their undying loyalty to the kampaku. Hideyoshi accepted their submissions, noted their names, and kept marching.

The real fighting happened on Hidenaga’s eastern front. As the eastern column advanced through Hyūga, it ran into the fortress of Takajō, defended by Yamada Shinsuke Arinobu. Hidenaga laid siege. The Shimazu, recognising that Takajō was the point where they could still make a difference, dispatched a large relief army under Yoshihisa, Yoshihiro, and Iehisa themselves, the full Shimazu leadership, committed to a single throw.

The decisive engagement came on May 24, 1587. Hidenaga intercepted the Shimazu relief force and, deploying his vast numerical superiority along with devastating volleys of massed musketry, shattered it. The Battle of Takajō was not close. The Shimazu brothers retreated with their army in ruins, and what had been a fighting withdrawal became a collapse.

Four days later, the Shimazu sent hostages to Hidenaga. On June 13, Shimazu Yoshihisa formally surrendered to Hideyoshi at the Taheiji camp. From first landing to final capitulation, the Kyūshū campaign had lasted roughly half a year. An island that three clans had spent a decade fighting over had been absorbed into the Toyotomi state in the time it takes to grow a crop of rice.

Chapter Six

The Priest and the Galley

Throughout the campaign, Hideyoshi had been perfectly cordial toward the Christians he encountered. The Ōtomo and Arima, both Christian houses, had been his allies from the start. Christian samurai fought in his vanguard with crosses painted on their helmets and banners, a striking sight in any army, let alone a sixteenth-century Japanese one. Hideyoshi had met the Jesuit Vice-Provincial, Gaspar Coelho, in 1586, and the encounter had been friendly enough. The kampaku seemed fascinated by European technology, charmed by the Jesuits’ learning, and perfectly happy to let the missionaries continue their work.

Coelho, for his part, was convinced he had found the church’s greatest patron since Constantine. Here was the most powerful man in Japan, apparently well-disposed toward Christianity, and all Coelho had to do was keep him happy. The Vice-Provincial’s strategy for keeping Hideyoshi happy was, unfortunately, to boast.

At their 1586 meeting, Coelho had told Hideyoshi that he could rally all the Christian daimyō of Kyūshū to fight for the kampaku’s cause. He offered to arrange for two heavily armed Portuguese warships to support Hideyoshi’s planned invasion of China. He presented himself not as a humble priest tending his flock but as a power broker with a private military network and connections to the most formidable naval force in Asia.

To Coelho, this was salesmanship, giving a powerful patron reasons to value the Jesuit presence. To Hideyoshi, who had just spent years crushing the militarised Buddhist monasteries of the Ikkō-ikki and the warrior monks of Mount Hiei, this was a priest telling him that he commanded an army.

Then Coelho made it worse. During the Kyūshū campaign, as Hideyoshi’s procession moved through the conquered territories, the Vice-Provincial arrived to greet the kampaku aboard his own fusta, a European-rigged galley armed with artillery. In the context of sixteenth-century Kyūshū, where maritime power was a serious military asset, arriving on an armed warship was not a greeting. It was a demonstration.

Hideyoshi looked at the galley. He looked at Coelho. He looked at the fortified port of Nagasaki, which the Jesuits had administered as a sovereign territory since Omura Sumitada ceded it to them in 1580, a Christian city with walls and cannons. He looked at the Christian daimyō who had marched in his army with crosses on their armour, and he did the political calculus that all successful rulers eventually do: he counted the things that could hurt him.

A foreign religious order. Armed ships. Fortified cities. Mass conversions of warriors. A network of fanatically loyal converts in the military class. An alliance with the most powerful maritime empire in Asia.

Chapter Seven

The Night at Hakata

What happened on the night of July 24, 1587, at Hakata, has the quality of a political thunderclap. One moment, the relationship between Hideyoshi and the Jesuits appeared cordial. The next, everything was on fire.

Late that night, Hideyoshi sent emissaries to rouse Coelho from sleep and confront him with four pointed questions. Why did the missionaries use coercion to make converts? Why did they destroy Buddhist temples and Shinto shrines? Why did they eat horses and cattle, useful working animals in a country that did not traditionally consume them? And why did they allow Portuguese merchants to purchase Japanese people and ship them abroad as slaves?

These were not idle provocations. The forced conversions and temple destructions were well-documented facts, Christian daimyō like Ōtomo Sōrin and Omura Sumitada had razed Buddhist and Shinto sites across their domains and compelled mass baptisms among their subjects. The consumption of beef and horsemeat violated Japanese cultural norms. And the slave trade was real: Portuguese merchants had been buying Japanese captives, many of them taken in the endless civil wars, and exporting them to Goa, Macau, and the Philippines, a practice that horrified even some of the Jesuits.

The following morning, Hideyoshi issued his edict. Christianity was a “pernicious doctrine.” All missionaries were to leave Japan within twenty days.

Chapter Eight

The Edict’s Edge

The expulsion decree of July 1587 was both draconian and, in practice, carefully calibrated. Hideyoshi was furious with the Jesuits, but he was not stupid. The Portuguese carracks that called at Nagasaki carried Chinese raw silk, gold, and European firearms, commodities and money that Hideyoshi needed for his military ambitions, which now included the invasion of Korea and, eventually, China itself. Destroying the Jesuit mission meant destroying the trade, because the Portuguese merchants relied on the Jesuits as interpreters, brokers, and intermediaries with the Japanese market.

So Hideyoshi calibrated his response. The missionaries were expelled, but the merchants were explicitly welcomed. Trade would continue; proselytising would not. It was a scalpel, not a sledgehammer, a deliberate separation of commerce from religion that revealed the edict as primarily political rather than economic in motivation.

Coelho, astonishingly, responded to the crisis by attempting to organise an armed rebellion. He urged the Christian daimyō to fortify their castles against Hideyoshi. He sent frantic messages to Manila, Macau, and Goa, begging for soldiers and weapons. He proposed, in effect, a Christian military alliance against the most powerful warlord in Japan.

The Christian lords, who had just watched Hideyoshi march a quarter of a million men through Kyūshū and crush the Shimazu in six months, declined. They had seen the arithmetic. Coelho’s own Jesuit superiors were appalled and reprimanded him fiercely.

In the event, the edict was never strictly enforced. Hideyoshi understood that expelling the Jesuits entirely would sever the trade connection, and he was not prepared to pay that price. The missionaries went underground, exchanged their cassocks for Japanese robes, and continued their work quietly across Kyūshū. The kampaku knew perfectly well what they were doing and chose not to see it. The result was a shadow existence, officially expelled, practically tolerated, that would last until the far harsher persecutions of the Tokugawa era.

But the era of open Jesuit political power in Japan was finished. No more fortified cities. No more armed galleys. No more priests brokering military alliances between Christian warlords and foreign empires. Coelho’s galley had sailed into Hideyoshi’s harbour and out of history.

Chapter Nine

The New Map

With the Shimazu subdued and the Jesuits defanged, Hideyoshi turned to the part of conquest he enjoyed most: rearranging power. The post-campaign redistribution of Kyūshū was a masterclass in the political engineering that was transforming Japan’s medieval patchwork of independent lordships into a centralised state.

The principle was simple. No clan would be destroyed, that risked guerrilla resistance and was expensive in men and time. Instead, every house on the island would be reduced, relocated, or reinforced according to a single criterion: loyalty to Hideyoshi.

The Shimazu, who had nearly conquered the entire island, were pushed back to their 1577 borders, the provinces of Satsuma, Ōsumi, and southern Hyūga. It was a massive reduction, but Hideyoshi left them with over 550,000 koku of assessed income, making them the wealthiest house in Kyūshū and the sixth-largest domain in Japan. This was calculated generosity. Total destruction would have been a quagmire; a humiliated but intact Shimazu clan, grateful for its survival and watchful of Toyotomi power, was manageable.

The Ōtomo, the clan whose plea for help had started the whole campaign, fared less well than they might have hoped. Sōrin himself died during the settlement negotiations, and his son Yoshimune was confined to the single province of Bungo, assessed at 378,000 koku. It was a fraction of the six-province empire the Ōtomo had once claimed, and a pointed reminder that gratitude had its limits.

The Ryūzōji remnant kept four districts in Hizen, but the real power in their territory passed to Nabeshima Naoshige, a former Ryūzōji captain who had demonstrated the political flexibility Hideyoshi valued. Nabeshima would eventually control a domain of 357,000 koku centred on Saga, effectively supplanting the family he had once served.

The minor Christian lords, Arima at 40,000 koku, Omura at 25,000 koku, the Matsuura of Hirado at 63,000 koku, were confirmed in their small traditional holdings. They were too minor to pose a threat and too connected to the Portuguese trade to discard.

But the real transformation came with the outsiders. Hideyoshi planted his own men across Kyūshū like flags on a conquered map. Kobayakawa Takakage, a Mōri loyalist and one of the campaign’s vanguard commanders, received a massive domain in Chikuzen, over 300,000 koku, anchoring the island’s northern coast. Kuroda Yoshitaka, the brilliant strategist known as Jōsui, was installed in eastern Buzen with a domain assessed between 120,000 and 180,000 koku, watching the strait. Sassa Narimasa, a hardened veteran, was given nearly all of Higo Province, charged with subduing its notoriously rebellious local lords.

These transplanted generals served a dual purpose. They were Hideyoshi’s eyes and ears on an island with a long history of independence, and they were a physical barrier between the reduced Shimazu and any thought of recovery. The native Kyūshū clans, stripped of their conquests and ringed by outsiders, were now what the Japanese political vocabulary of the era called “potted plants”, lords who could be uprooted and replanted at the ruler’s pleasure.

Several familiar Kyūshū families were literally uprooted. Akizuki Tanezane was moved from his base in the northwest to a 30,000 koku fief at Takarabe in Hyūga, far from his old networks and old allies. Tachibana Muneshige was transferred from Chikuzen to Yanagawa in Chikugo with 132,000 koku. The Itō clan, driven from Hyūga by the Shimazu years earlier, were restored to a modest 57,000 koku fief at Obi, a minor compensation for their losses, but enough to ensure their loyalty.

And Nagasaki, the fortified Jesuit port, the cause of so much of Hideyoshi’s alarm, was confiscated outright. It became an imperial city, a chokkatsuchi, directly administered by a Hideyoshi-appointed governor. The lucrative anchorage fees, the customs revenue, the diplomatic leverage of controlling the sole port of call for the Portuguese carracks, all of it now flowed to the Toyotomi treasury. The Jesuits’ seven years of territorial sovereignty over the port were erased.

Chapter Ten

What the Campaign Changed

Hideyoshi’s Kyūshū campaign is sometimes treated as a straightforward military operation, the biggest warlord crushes the second-biggest warlord, absorbs his territory, moves on. This misses its significance.

The campaign ended the last serious pocket of independent power in Japan. After 1587, no region of the country operated outside the Toyotomi system. The medieval world of autonomous warrior houses, each pursuing its own foreign policy and its own wars, was over. Kyūshū’s daimyō, the Shimazu, the Ōtomo, the Arima, the Omura, were no longer sovereign lords. They were administrators, holding their domains at the pleasure of the central power and subject to transfer, reduction, or elimination at any time.

For the Portuguese and the Jesuits, 1587 was the watershed moment. Before the campaign, the mission in Japan had been built on a foundation of political alliances with independent Kyūshū lords who needed Portuguese trade goods and Jesuit connections to survive. The Jesuits administered their own city. They brokered military alliances. They acted as interpreters, financiers, and diplomatic intermediaries with a degree of autonomy that had no parallel in any other mission field in Asia.

After the campaign, all of that was gone. The Christian daimyō were now Hideyoshi’s vassals, not the Jesuits’ clients. Nagasaki was a government city, not a Jesuit colony. The trade continued, but the missionaries’ role in it was tolerated rather than encouraged, and the toleration could be withdrawn at any moment. The Jesuits had lost their political independence, and with it the leverage that had made them indispensable.

The specific chain of events, Coelho’s boasts, the armed galley, the fortified port, the midnight interrogation at Hakata, makes the 1587 edict look like a personal reaction to Jesuit overreach. And it was, in part. But it was also the inevitable consequence of a centralising state encountering a foreign institution that had accumulated political, military, and territorial power within its borders. Hideyoshi would have confronted the Jesuit question eventually, with or without Coelho’s galley. The Vice-Provincial simply accelerated the timeline.

The shadow of 1587 stretches long. The edict set the precedent for every subsequent anti-Christian measure, the far harsher persecutions under Tokugawa Ieyasu and his successors, the martyrdoms, the fumie trampling tests, and ultimately the sakoku edicts that would close Japan to the outside world. Hideyoshi’s blunt questions at Hakata, about forced conversions, destroyed temples, and the slave trade, became the template for the Tokugawa critique of Christianity. The kampaku had identified the vulnerabilities of the mission, and the shoguns who followed him would exploit them to the point of annihilation.