Koshamain's War
From Infogalactic: the planetary knowledge core
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]
