Battle of Shakushain (Ainu uprising)

Timeline

1. 1669Shibuchari (around Shinshinotsu town area) · Hidaka SubprefectureConflicts over fishing and hunting rights between Shakushain, a chieftain of the Hidaka region, and the Ainu of the Hae faction escalated; the sudden death of a returning envoy was wrongly reported as poisoning by Matsumae, triggering joint Ainu attacks across eastern and western Ezo on Japanese merchant ships, falconry grounds, and outposts, killing 153 in eastern Ezo and 120 in western Ezo.
2. 1669–1671Kunushiri River battlefield · HokkaidoMatsumae domain, joined by reinforcements from Tsugaru, Nambu, Akita, and Sendai domains, suppressed the Ainu forces with about 200 firearms. Though the Ainu army at times held the advantage, it was ultimately forced into prolonged resistance due to inferior weapons and organization, with the Kunushiri River area becoming the decisive battlefield.
3. 1672Matsumae domain-controlled area · Oshima SubprefectureShakushain accepted Matsumae domain's invitation to a peace banquet and was killed by samurai during the feast. The Ainu coalition collapsed without leadership; the shogunate rewarded Matsumae domain, large-scale chieftain alliances in Ezo never again appeared, and Ainu society turned toward small kin-based communities.