What Happened to Shingen's "Koshu-Ryu Military Science" that Ieyasu Learned After It Was Adopted by the Tokugawa Army?
Summary by BUSHOO!JAPAN(武将ジャパン)
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Have you ever heard of Koshu-ryu military science, or even the term "Koshu-ryu fortification techniques"? Sengoku fans have likely been intrigued by the term at least once, but the reason it all became so popular was actually one military commander: Ishikawa Kazumasa, who is said to have built the current Matsumoto Castle tower. Ishikawa Kazumasa / Quoted from Wikipedia Koshu-ryu military science began when Ieyasu took notice Ishikawa Kazumasa w…
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