Koshamain's War

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]

^ 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.
^ 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.

[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.

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