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There is a natural fortress Castle was built on the terraces steep the confluence of the Tone-River and Akaya-River

Commanded Katsuyori Takeda Masayuki Sanada, a castle that was built as a front-line base in order to take the Numata territory from Hojo after becoming a hostile relationship, is a castle that triggered Hideyoshi of unification in after the.

Remains is a fortress the three-Guo and secondary Guo, this main-Guo,Sasa-Guo and major Guo lined directly from the horse out.

In recent years of excavations, it has been identified important remains are numerous.