In 1189, when the Kamakura bakufu planned Oshu-seibatsu (the Kamakura bakufu's military campaign against the Fujiwara clan in northern Japan), Yukifumi was ordered by his lord FUJIWARA no Yasuhira to ally with Munebumi AKITA in order to fight against Yoshikazu HIKI, who marched to the north from Echigo province, and the Bakufu force led by Sanemasa USAMI.
文治5年（1189年）、鎌倉幕府の奥州征伐に際し、主君・藤原泰衡の命を受け、秋田致文と共に、越後国方面より北進してきた比企能員と、宇佐美実政の率いる幕府軍と戦った。