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In page Tokugawa Ieyasu:

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On January 15, 1564, Ieyasu decided to concentrate his forces to attack and eliminate the Ikkō-ikki from Mikawa. In the Battle of Azukizaka, Ieyasu was fighting on the front lines and was nearly killed when he was struck by several bullets, but survived because they did not penetrate his armor.[3] Both sides were using new gunpowder weapons which the Portuguese had introduced to Japan 20 years earlier. At the end of battle, the Ikkō-ikki were defeated. By 1565, Ieyasu had become the master of all of Mikawa Province.[citation needed]