georgy-konstantinovich-zhukov:Shikizan castle, 1550.The concentric mountain peaks created a natural
georgy-konstantinovich-zhukov:Shikizan castle, 1550.The concentric mountain peaks created a natural base on which to build a series of baileys and streams were diverted to provide a water source for the moats. It would be besieged and fall to Oda Nobunaga in 1577 during the establishment of the Shogunate. -- source link
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