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Futamata fortress was Takeda Shingen's first objective in his campaign against Tokugawa Ieyasu. In 1572 he left the siege of Futamata in the hands of his son and heir Takeda Katsuyori. The fortress was built on the edge of a cliff, overlooking the Tenryū river; Katsuyori noticed that the garrison's water supply was obtained via a complex system of dropping wooden buckets to the river and pulling them back up. He decided to send unmanned rafts down the river; these smashed into the well-tower and toppled it. Deprived of their water supply, the Tokugawa garrison quickly surrendered. The Takeda would press on past Futamata towards the major Tokugawa fortress at Hamamatsu, where they would fight the Battle of Mikatagahara two months later. ==References== *Turnbull, Stephen (1998). 'The Samurai Sourcebook'. London: Cassell & Co. *Turnbull, Stephen (2002). 'War in Japan: 1467-1615'. Oxford: Osprey Publishing. * 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「Siege of Futamata」の詳細全文を読む スポンサード リンク
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