Yoritoki and the Abes came into conflict with the
Minamoto clan as it began to expand north into Abe territory. The Abe clan began to raid territories south of their border. In 1051 Yoritoki led an army of Emishi into northern Miyagi and defeated a government army at Onikiribe that had been sent to stop the raids. This event triggered the Former Nine Years' War (
Zenkunen War).
Minamoto no Yoriyoshi was then deputized as the new
Chinjufu Shogun and sent to chastise Yoritoki in 1053. In 1056 Yoritoki's eldest son, Sadato, began skirmishing with the Minamotos. War erupted in 1057 and Yoritoki was killed in battle by a stray arrow. Yoritoki's sons continued fighting for a time but were finally overwhelmed by combined Minamoto and
Kiyowara armies in 1062. ==Legacy==