Subsequently, when his eldest brother MINAMOTO no Yoriyoshi joined Zen Kunen no Eki (Former Nine Years' Campaign), it is said that Yorisue and his son Mitsuzane took part in the campaign.
つづいて、前九年の役（1056年〜1062年）で長兄の源頼義が出陣すると、頼季・満実父子も従軍したとされている。