In April of the same year, Koremori, together with TAIRA no Shigehira and TAIRA no Tadanori, defeated MINAMOTO no Yukiie in the Battle of Sunomata-gawa River in Owari Province, which earned him Junii (Junior Second Rank), and the posts of U-Chujo (lieutenant general of the Imperial Guards of the Right) and Kurodo no to (head chamberlain), which made people call him Komatsu no Chujo (literally General of the small pines).
同年3月、尾張国墨俣川に平重衡、平忠度と共に源行家を破り、従二位右中将・蔵人頭となり小松中将と呼ばれる。