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Sanada Maru
The was a small fortification attached to Osaka castle. It is famous for being impregnable and playing a key role in defending the castle in the winter of 1615. Later, it was forcefully destroyed despite being exempt from the reconciliation condition. ==Background== Osaka castle was built on the Uemachi plateau enclosed by the Yodo River and the Yamato River. It was well fortified to the north but weakly guarded to the southern Tennōji plateau. Sanada Yukimura build the fortification in front of the outer moat, at the Kuruwa port, at the southeastern Hirano-guchi (平野口) gate and beside the Kuromon-guchi (黒門口) gate. Due to its position, Sanada Maru became an obstacle to the main Tokugawa force during the Siege of Osaka. By 1615, after its destruction, the tower keep era had reached its peak and construction declined with the establishment of the ''Pax Tokugawa'', which lasted until the Meiji period in the late 19th century.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Sanada Maru」の詳細全文を読む
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