On August 21, a retainer of the Kubota Domain supporting the new government murdered an emissary from the alliance's Sendai Domain and managed to control the opinions of people within the Kubota Domain, and the Kubota Domain defected from the alliance to the new government.
7月4日、新政府を支持する久保田藩士が、同盟側仙台藩の使者を殺害し藩論を掌握、同盟を離脱して新政府側へと変節した。