Yoriyoshi gave gifts to KIYOHARA no Mitsuyori, a fushu in the Senboku district of Dewa Province (Akita Prefecture) who had maintained neutrality, and requested that he enter the war, after which a large army commanded by Mitsuyori's younger brother, Takenori KIYOHARA, entered the conflict.
頼義が、中立を保っていた出羽国仙北郡（秋田県）の俘囚清原光頼に珍奇な物を贈り参戦を依頼し、光頼の弟清原武則率いる大軍が参戦したこと。