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In page Miyamoto Musashi:

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According to The Book of Five Rings, Musashi testified that his first duel occurred when he was still 13 years old. His opponent was a Arima Kihei, a swordsman who practised Kashima Shintō-ryū martial arts that were created by Tsukahara Bokuden. Musashi was victorious. The second duel happened when Musashi was 16 years old, when he won another victory against Tadashima Akiyama, a swordsman who was native to Tajima Province. Musashi's third duel, at age 21 was in Kyoto, where he defeated several students of a famous sword fighting school.[citation needed]