According to the Koyo Gunkan, Hara Osumi no Kami was the Samurai who drove Uesugi Kenshin off during the 4th battle of Kawanakajima. Hara was reported to have thrust at Kenshin with a spear, but missed and struck the horse in the flank instead.
Sources
"Sengoku Bushou Omoshiro Jiten", Naramoto Tatsuya, 1998
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