In 1051 when Yoriyoshi ABE raised a rebellion army (the Zenkunen War [the Early Nine Years' War]), Yoritoo went to Mutsu Province under the command of MINAMOTO no Yoriyoshi and fought against the rebellion army.
永承6年（1051年）、安倍頼良が乱を起こすと（前九年の役）、源頼義に従い陸奥国に赴いて戦う。