Nagashino 1575A compact, illustrated guide to a key battle that originated firearm warfare in Japan. When Portuguese traders took advantage of the constant violence in Japan to sell the Japanese their first firearms, one of the quickest to take advantage of this new technology was the powerful daimyo Oda Nobunaga. In 1575, the impetuous Takeda Katsuyori laid siege to Nagashino castle, a possession of Nobunaga's ally, Tokugawa Ieyasu. An army was despatched to