Koshamain's War (コシャマインの戦い, Koshamain no tatakai) was an armed struggle between the Ainu and Wajin that took place on the Oshima Peninsula of southern Hokkaidō, Japan, in 1457. Escalating out of a dispute over the purchase of a sword, Koshamain and his followers sacked twelve forts in southern Ezo (道南十二館), before being overcome by superior forces under Takeda Nobuhiro. The principal record of the conflict is Shinra no Kiroku.[1][2]

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  1. ^ Shindō Tōru. コシャマインの戦いに関する『新羅之記録』の史料的検討 [Study on the records about the Koshamain Battle in ‘Shinra-no-Kiroku’] (in Japanese). University of Tsukuba. Retrieved 13 November 2016.
  2. ^ Walker, Brett L (2001). The Conquest of Ainu Lands: Ecology and Culture in Japanese Expansion,1590-1800. University of California Press. p. 27. ISBN 978-0520248342.