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Oga Yashiro is a traitor who offered to let Takeda Katsuyori into the Tokugawa-controlled castle at Okazaki. His plot was discovered and he died by the bamboo saw after 7 days.
References
Turnbull, Stephen (1987). Battles of the Samurai. London: Arms and Armour Press. p. 81. ISBN9780853688266.
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