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Siege of Odawara 1590: Final Battle for Unification of Japan
In 1590, Toyotomi Hideyoshi besieged Odawara with 220,000 troops, ending the Hojo era and effectively concluding the Sengoku period. Three months of siege, the tragic fall of Hachioji Castle, the suicides of Hojo Ujimasa, and Tokugawa Ieyasu's transfer to Kanto reshaped Japan.
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Author
Taketoki
| Samurai History
In 1590 (Tensho 18), Toyotomi Hideyoshi launched a 220,000-strong campaign against the Hojo at Odawara Castle, the final great battle of the Sengoku era. Triggered by the Hojo’s seizure of Sanada’s Nagurumi Castle in violation of Hideyoshi’s general peace edict, the campaign opened with the half-day fall of Yamanaka Castle, continued with three months of siege from Ishigakiyama, and saw the tragic destruction of Hachioji Castle. After Hojo Ujinao’s surrender on July 5, his father Ujimasa committed seppuku (their tomb survives in Odawara). Tokugawa Ieyasu was transferred to the Kanto region, laying the foundation for the future Edo Shogunate.
Last updated: May 2, 2026
Siege of Odawara 1590 — Hideyoshi's 220,000 troops surround the castle
Wikimedia Commons / Public Domain
Portrait of Hojo Ujimasa — committed seppuku after the siege
Wikimedia Commons / Public Domain
Hachioji Castle ruins — most tragic site of the Odawara campaign
Wikimedia Commons / CC BY-SA 3.0
Tokugawa Ieyasu — gained the foundation for hegemony through the post-Odawara transfer
Wikimedia Commons / Public Domain
Tombs of Ujimasa and Ujiteru — the two Hojo lords who took their own lives
Wikimedia Commons / CC BY-SA 3.0
── 了 ──
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Author
Taketoki（たけとき）
Samurai History
Toku editorial team — samurai history. Insists on primary sources and castle-layout diagrams, walking battlefields from Yoritomo's Izu exile sites to the late-Edo battlegrounds.
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Visit Related Places
History truly comes alive when you visit in person. Choose your next destination from the related sites and pilgrimage courses below.
1. Odawara Castle
Stronghold of five generations of Hojo — Toyotomi Hideyoshi's 1590 siege here ended the Sengoku era and unified Japan
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2. Ishigakiyama Ichiya-jo
A national historic site — the first full stone-wall castle in Kanto, built by Hideyoshi in 80 days to overlook besieged Odawara
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3. Yamanaka Castle
A Later Hojo mountain castle of nationally designated earthwork ruins — fell in half a day in 1590
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4. Soun-ji
Family temple of five Hojo generations, founded in 1521 by Ujitsuna for his father Soun — the nationally designated garden and five lords' graves stand in Hakone-Yumoto
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The graves of Hojo Ujimasa and Ujiteru — the last Hojo lords who took their own lives after Hideyoshi's 1590 siege
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