Qualla: Iwabitsu Castle

Iwabitsu Castle: Introduction

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit photo: Qurren (talk) Taken with Canon PowerShot G9 X, CC BY-SA 4.0. Takeda Katsuyori never made it. In 1582, with his clan collapsing around him and enemies closing in from every direction, the last lord of the Takeda was supposed to find refuge here, on Mount Iwabitsu, behind the walls of a fortress perched high above the Agatsuma River valley. But treachery among his own retainers cut the escape route short, and Katsuyori committed seppuku before reaching safety. The castle that might have saved him still stands in ruin on this mountainside in northwestern Gunma Prefecture, a silent monument to the ambitions and betrayals of Japan's Sengoku period.

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Image: photo: Qurren (talk) Taken with Canon PowerShot G9 X | CC BY-SA 4.0

Iwabitsu Castle: A Fortress Between Provinces

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit デジタルカメラ, Public domain. Iwabitsu Castle occupies a commanding position in the long valley carved by the Agatsuma River, a tributary of the Tone. This was no accident. The valley formed the route of the Shinshu Kaido, the highway connecting Takasaki to Shinano Province via the Torii Pass. Whoever held th...

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Image: デジタルカメラ | Public domain

Iwabitsu Castle: The Sanada Gambit

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Alexrk2, CC BY-SA 3.0. The Sanada clan changed everything. Sanada Yukitaka, expanding from Shinano Province into northern Kozuke with the formidable Takeda Shingen backing his moves, set his sights on Iwabitsu. The Saito clan turned to Uesugi Kenshin of distant Echigo Province for help, but the geograp...

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Image: Alexrk2 | CC BY-SA 3.0

Iwabitsu Castle: A Family Divided

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit photo: Qurren (talk) Taken with Canon PowerShot G9 X, CC BY-SA 4.0. The death of Toyotomi Hideyoshi in 1598 fractured Japan once again, and the Sanada family fractured with it. Father and son chose opposite sides. Sanada Masayuki stayed loyal to the Toyotomi heir and his regent Ishida Mitsunari. His son Sanada Nobuyuki, who had received Iwabitsu ...

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Image: photo: Qurren (talk) Taken with Canon PowerShot G9 X | CC BY-SA 4.0

Iwabitsu Castle: Ghost Stones on the Mountain

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit photo: Qurren (talk) Taken with Canon PowerShot G9 X, CC BY-SA 4.0. Today, nothing survives of the original castle structures. The site requires commitment to visit: a thirty-minute walk from Gunma-Haramachi Station on the JR East Agatsuma Line brings you to the trailhead, followed by another thirty-minute hike up the mountainside to reach where ...

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Image: photo: Qurren (talk) Taken with Canon PowerShot G9 X | CC BY-SA 4.0