Military Wiki
Siege of Iwamura
Part of the Sengoku period
LocationIwamura Castle, Mino province, Japan
Result Castle falls; Akiyama victory
forces of Takeda Shingen Iwamura castle garrison
Commanders and leaders
Akiyama Nobutomo Tōyama Kagetō

The 1572 siege of Iwamura was concurrent with Takeda Shingen's push into Tōtōmi Province and the famous Battle of Mikatagahara. Akiyama Nobutomo, one of Shingen's "Twenty-Four Generals," set his eye on the great yamashiro (mountain castle) of Iwamura when Tōyama Kagetō, the commander of the castle's garrison, fell ill and died.

Akiyama negotiated the castle's surrender with Tōyama's widow, Lady Otsuya, and took it without any bloodshed. The official keeper of the castle, a seven-year old lord called Gobōmaru, was taken to the Takeda home province of Kai as a hostage. In accordance with the surrender treaty, Lady Otsuya, who was the aunt of Oda Nobunaga, married Akiyama and she remained the lady of the castle.


  • Turnbull, Stephen (1998). The Samurai Sourcebook. London: Cassell & Co.

This page uses Creative Commons Licensed content from Wikipedia (view authors).