Iouji Fort


IoujiToride (11).JPG


Iōji-toride, also called Iōjiyama-jinsho, was the honjin (main fortified encampment) of Takeda Katsuyori during the Battle of Nagashino. Iōji-toride overlooked Nagashino Castle, and was used during the siege of the Tokugawa-held stronghold. The 'Battle of Nagashino' mostly refers to the skirmishes around the castle and the siege, whilst the famous ill-fated cavalry charge of the Takeda happened to the southwest at Shitaraǵahara.

Visit Notes

Iōji-toride is a hilltop fort site in Nagashino Township, Shinshiro Municipality. Ruins feature earthworks, including trenches and baileys. There are three baileys: east, west and middle/main. Between the middle and east bailey is a dobashi (earthen bridge). There is a trench between the middle and west bailey. The main bailey, where Takeda Katsuyori encamped, has a reconstructed miyagura (watchtower), erected in 2010. Nagashino Castle can be seen from the fort.

Iōji-toride is also called Iōjiyama-jinsho, a jinsho being an encampment site, and specifically is known as the main encampment of Takeda Katsuyori during his siege of Nagashino Castle in 1575. The site is accessed via well maintained trails, and I took the one to the right of Iōji (Temple). It takes less than ten minutes to walk up.

  • Koguchi (gate site)
  • Restored watchtower
  • Dobashi (earthen bridge)
  • Horikiri (trench) and berm

Castle Profile
English Name Iouji Fort
Japanese Name 医王寺砦
Alternate Names Iōjiyama-jinsho (医王寺山陣所・医王寺山武田勝頼本陣)
Founder Takeda Katsuyori
Year Founded 1575
Castle Type Mountaintop
Castle Condition No main keep but other buildings
Designations Local Historic Site
Historical Period Pre Edo Period
Artifacts Miyagura (reconstructed), horikiri, dobashi, kuruwa, &c.
Features turrets, trenches
Visitor Information
Access Nagashinojō Station on the Iida Line; rental bike from Nagashino Castle museum to Iōji
Visitor Information 24/7 free; mountain
Time Required 40 minutes
Location Shinshiro, Aichi Prefecture
Coordinates 34° 55' 53.11" N, 137° 33' 28.40" E
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Added to Jcastle 2023
Contributor ART
Admin Year Visited Viewer Contributed
Friends of JCastle
Jōkaku Hōrōki
Yacchan no Oshiro Blog

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