Qualla: Odani Castle

Odani Castle: Introduction

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit 投稿者がファイル作成, Public domain. The mountain looked impregnable. That was the whole point. When the Azai clan began building Odani Castle around 1520, they chose a peak in northern Omi Province whose ridges and valleys could be sculpted into a fortress stretching over a square kilometer, its main fortified area running more than 800 meters along the crest. For half a century, it worked. The Azai rose from minor warlords to the dominant power in the region, fought off armies of 25,000 men, and married into the family of Oda Nobunaga himself. Then Nobunaga came to tear it all down, and the mountain that had protected the Azai became their tomb.

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Image: 投稿者がファイル作成 | Public domain

Odani Castle: Clawing Up from Nothing

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit 投稿者が撮影, Public domain. The Azai were nobodies. Northern Omi Province in the early 1500s belonged to the Kyogoku clan, vassals of the Ashikaga shogunate who preferred the comforts of Kyoto to the unglamorous work of governing a rural province. They ruled by proxy, and their proxies were weak. Azai Sukem...

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Image: 投稿者が撮影 | Public domain

Odani Castle: A Marriage That Became a Trap

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit 投稿者が撮影, Public domain. By the 1560s, Azai Nagamasa had transformed his clan from regional upstarts into serious players. He defeated a Rokkaku invasion force of 25,000 with a much smaller army and pushed aggressively into neighboring provinces. But expansion brought him face to face with the most dange...

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Image: 投稿者が撮影 | Public domain

Odani Castle: The Siege That Broke the Mountain

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit 投稿者が撮影, Public domain. The war that followed was brutal and drawn out. At the Battle of Anegawa in 1570, fought just five kilometers south of Odani Castle, the Azai were defeated and lost half their territory. But the mountain held. With Asakura reinforcements, Odani Castle resisted Nobunaga's siege fo...

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Image: 投稿者が撮影 | Public domain

Odani Castle: Stripped for Parts

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit 投稿者が撮影, Public domain. What happened next was both practical and symbolic. Hideyoshi did not abandon Odani Castle immediately. He used it as his headquarters while he supervised the construction of a new castle on the shores of Lake Biwa -- Nagahama Castle. But a mountaintop fortress was the wrong tool...

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Image: 投稿者が撮影 | Public domain

Odani Castle: What the Mountain Still Holds

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Alexrk2, CC BY-SA 3.0. Today, little remains of the fortress except fragmentary dry moats, crumbling stone walls, and the massive 20-meter-wide central moat that once divided the castle into its old and new sections. The ruins were designated a National Historic Site in 2005. Reaching them requires a 4...

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Image: Alexrk2 | CC BY-SA 3.0