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The Sengoku period (戦国時代 Sengoku Jidai, "Age of Warring States"; c. 1467 – c. 1600) is a period in Japanese history marked by social upheaval, political intrigue and near-constant military conflict. Japanese historians named it after the otherwise unrelated Warring States period in China. It was initiated by the Ōnin War, which collapsed the Japanese feudal system under the Ashikaga shogunate, and came to an end when the system was re-established under the Tokugawa shogunate by Tokugawa Ieyasu.
During this period, although the Emperor of Japan was officially the ruler of his nation and every lord swore loyalty to him, he was largely a marginalized, ceremonial, and religious figure who delegated power to the shōgun, a noble who was roughly equivalent to a generalissimo. In the years preceding this era the Shogunate gradually lost influence and control over the daimyōs (local lords). Although the Ashikaga shogunate had retained the structure of the Kamakura shogunate and instituted a warrior government based on the same social economic rights and obligations established by the Hōjō with the Jōei Code in 1232,[clarification needed] it failed to win the loyalty of many daimyōs, especially those whose domains were far from the capital, Kyoto. Many of these Lords began to fight uncontrollably with each other for control over land and influence over the shogunate. As trade with Ming China grew, the economy developed, and the use of money became widespread as markets and commercial cities appeared. This, combined with developments in agriculture and small-scale trading, led to the desire for greater local autonomy throughout all levels of the social hierarchy. As early as the beginning of the 15th century, the suffering caused by earthquakes and famines often served to trigger armed uprisings by farmers weary of debt and taxes.
The Ōnin War (1467–1477), a conflict rooted in economic distress and brought on by a dispute over shogunal succession, is generally regarded as the onset of the Sengoku period. The "eastern" army of the Hosokawa family and its allies clashed with the "western" army of the Yamana. Fighting in and around Kyoto lasted for nearly 11 years, leaving the city almost completely destroyed. The conflict in Kyoto then spread to outlying provinces.
The period culminated with a series of three warlords, Oda Nobunaga, Toyotomi Hideyoshi, and Tokugawa Ieyasu, who gradually unified Japan. After Tokugawa Ieyasu's final victory at the siege of Osaka in 1615, Japan settled down into several centuries of peace under the Tokugawa shogunate.
The Ōnin War in 1467 is usually considered the starting point of the Sengoku period. There are several events which could be considered the end of it: Nobunaga's entry to Kyoto (1568) or abolition of the Muromachi shogunate (1573), the Siege of Odawara (1590), the Battle of Sekigahara (1600), the establishment of the Tokugawa Shogunate (1603), or the Siege of Osaka (1615).
|1467||Beginning of Ōnin War|
|1477||End of Ōnin War|
|1488||The Kaga Rebellion|
|1493||Hosokawa Masamoto succeeds in the Coup of Meio|
|Hōjō Sōun seizes Izu Province|
|1507||Beginning of Ryo Hosokawa War (the succession dispute in the Hosokawa family)|
|1520||Hosokawa Takakuni defeats Hosokawa Sumimoto|
|1531||Hosokawa Harumoto defeats Hosokawa Takakuni|
|1535||Battle of Idano The forces of the Matsudaira defeat the rebel Masatoyo|
|1543||The Portuguese land on Tanegashima, becoming the first Europeans to arrive in Japan, and introduce the arquebus into Japanese warfare|
|1549||Miyoshi Nagayoshi betrays Hosokawa Harumoto|
|1551||Tainei-ji incident: Sue Harukata betrays Ōuchi Yoshitaka, taking control of western Honshu|
|1554||The tripartite pact among Takeda, Hōjō and Imagawa is signed|
|1555||Battle of Itsukushima: Mōri Motonari defeats Sue Harukata and goes on to supplant the Ōuchi as the foremost daimyo of western Honshu|
|1560||Battle of Okehazama: The outnumbered Oda Nobunaga defeats and kills Imagawa Yoshimoto in a surprise attack|
|1568||Oda Nobunaga marches toward Kyoto|
|1570||Beginning of Ishiyama Hongan-ji War|
|1573||The end of Ashikaga shogunate|
|1575||Battle of Nagashino: Oda Nobunaga decisively defeats the Takeda cavalry with innovative arquebus tactics|
|1580||End of Ishiyama Hongan-ji War|
|1582||Akechi Mitsuhide assassinates Oda Nobunaga (Honnō-ji Incident); Hashiba Hideyoshi defeats Akechi at the Battle of Yamazaki|
|1585||Hashiba Hideyoshi is granted title of Kampaku, establishing his predominant authority; he is granted the surname Toyotomi a year after.|
|1590||Siege of Odawara: Toyotomi Hideyoshi defeats the Hōjō clan, unifying Japan under his rule|
|1592||First invasion of Korea|
|1597||Second invasion of Korea|
|1598||Toyotomi Hideyoshi dies|
|1600||Battle of Sekigahara: The Eastern Army under Tokugawa Ieyasu defeats the Western Army of Toyotomi loyalists|
|1603||The establishment of the Tokugawa shogunate|
|1615||Siege of Osaka: The last of the Toyotomi opposition to the Tokugawa shogunate is stamped out|
The upheaval resulted in the further weakening of central authority, and throughout Japan regional lords, called daimyōs, rose to fill the vacuum. In the course of this power shift, well-established clans such as the Takeda and the Imagawa, who had ruled under the authority of both the Kamakura and Muromachi bakufu, were able to expand their spheres of influence. There were many, however, whose positions eroded and were eventually usurped by more capable underlings. This phenomenon of social meritocracy, in which capable subordinates rejected the status quo and forcefully overthrew an emancipated aristocracy, became known as gekokujō (下克上), which means "low conquers high".
One of the earliest instances of this was Hōjō Sōun, who rose from relatively humble origins and eventually seized power in Izu Province in 1493. Building on the accomplishments of Sōun, the Late Hōjō clan remained a major power in the Kantō region until its subjugation by Toyotomi Hideyoshi late in the Sengoku period. Other notable examples include the supplanting of the Hosokawa clan by the Miyoshi, the Toki by the Saitō, and the Shiba clan by the Oda clan, which was in turn replaced by its underling, Toyotomi Hideyoshi, a son of a peasant with no family name.
Well-organized religious groups also gained political power at this time by uniting farmers in resistance and rebellion against the rule of the daimyōs. The monks of the Buddhist True Pure Land sect formed numerous Ikkō-ikki, the most successful of which, in Kaga Province, remained independent for nearly 100 years.
After nearly a century of political instability and warfare, Japan was on the verge of unification by Oda Nobunaga, who had emerged from obscurity in the province of Owari (present-day Aichi Prefecture) to dominate central Japan, when in 1582 Oda was assassinated by one of his generals, Akechi Mitsuhide. This in turn provided Toyotomi Hideyoshi, who had risen through the ranks from ashigaru (footsoldier) to become one of Oda's most trusted generals, with the opportunity to establish himself as Oda's successor. Toyotomi eventually consolidated his control over the remaining daimyōs and, although he was ineligible for the title of Sei-i Taishōgun because of his common birth, ruled as Kampaku (Imperial Regent). During his short reign as Kampaku, Toyotomi attempted two invasions of Korea. The first spanning from 1592 to 1596 was initially successful but suffered setbacks to end in stalemate; the second begun in 1597 was less successful (as the Koreans and their Ming Chinese allies were prepared for the Japanese the second time around) and ended with Toyotomi's call for retreat from Korea on his deathbed in 1598.
Toyotomi had on his deathbed appointed a group of the most powerful lords in Japan—Tokugawa, Maeda Toshiie, Ukita Hideie, Uesugi Kagekatsu, and Mōri Terumoto—to govern as the Council of Five Regents until his infant son, Hideyori, came of age. An uneasy peace lasted until the death of Maeda in 1599. Thereafter a number of high-ranking figures, notably Ishida Mitsunari, accused Tokugawa of disloyalty to the Toyotomi regime.
This precipitated a crisis that led to the Battle of Sekigahara in 1600, during which Tokugawa and his allies, who controlled the east of the country, defeated the anti-Tokugawa forces, which had control of the west. Generally regarded as the last major conflict of the Sengoku period, Tokugawa's victory at Sekigahara effectively marked the end of the Toyotomi regime, the last remnants of which were finally destroyed in the Siege of Osaka in 1615.
Three unifiers of JapanEdit
The contrasting personalities of the three leaders who contributed the most to Japan's final unification—Oda, Toyotomi, and Tokugawa—are encapsulated in a series of three well known senryū:
- Nakanu nara, koroshite shimae, hototogisu (If the cuckoo does not sing, kill it.)
- Nakanu nara, nakasete miyō, hototogisu (If the cuckoo does not sing, coax it.)
- Nakanu nara, naku made matō, hototogisu (If the cuckoo does not sing, wait for it.)
Oda, known for his ruthlessness, is the subject of the first; Toyotomi, known for his resourcefulness, is the subject of the second; and Tokugawa, known for his perseverance, is the subject of the third verse.
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Nanboku-chō period (1334−1392)
(of Muromachi Period)
| History of Japan
(of Muromachi Period)