By the time of this war, Yoshihiro ASHINA had already become one of those many warlords coming under the umbrella of the chancellor Hideyoshi, therefore fighting against Ashina clan meant a defiance against Hideyoshi.
蘆名氏はすでに関白、秀吉傘下の大名となっており、政宗が蘆名氏と戦うことは秀吉への挑戦を意味していた。