The Sengoku period was an era of intense civil war, social upheaval, and political fragmentation in feudal Japan. Beginning with the Onin War, an 11-year conflict that devastated Kyoto and shattered the authority of the Ashikaga Shogunate, the central government lost effective control over regional domains. The collapse of court and shogunal power opened the way for gekokujo—the "low overthrowing the high"—as ambitious retainers, local strongmen, and upstart warriors displaced traditional elites. In this fractured landscape, sengoku daimyo emerged as independent warlords ruling their own territories. They built fortified castle towns, issued local laws, and maintained standing armies loyal to their domains rather than to any national authority. Warfare shifted dramatically during this era: mounted samurai duels gave way to mass infantry formations, and the arrival of matchlock firearms (tanegashima) from Portuguese traders in the 1540s transformed battlefield tactics.
Despite near-constant conflict, the Sengoku period saw remarkable cultural and economic development. Zen Buddhism, the tea ceremony, and new regional economies flourished, even as rival domains fought for supremacy. The era concluded with the unification campaigns of Oda Nobunaga, Toyotomi Hideyoshi, and ultimately Tokugawa Ieyasu, whose victory at Sekigahara in 1600 and establishment of the Tokugawa shogunate in 1603 brought an end to centuries of civil war. - AsNotedIn
| Place | Type | AsNotedIn | Locale | |
|---|---|---|---|---|
| Place | Type | AsNotedIn | Locale | |
| Mangan-ji | Tokyo | |||
| Genku-ji | Tokyo | |||
| Hachioji Castle ruins | Hachioji | |||
| Takiyama Castle ruins | Hachioji |
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