The Battle of Sunomata-gawa (墨俣川の戦い Sunomata-gawa no Tatakai) took place in Japan on 6 August 1181 (or by the Japanese calendar, Jishō-5 year, 4-month, 25-day), in the present-day town of Sunomata, Gifu Prefecture. The battle started when Minamoto no Yukiie attempted a sneak attack against his enemies during the night. He found Taira no Tomomori and his army directly opposite from his, along the Sunomata River, near the borders of Owari and Mino provinces. After crossing the river, the Minamoto went to the Yahagi River in Mikawa Province, but the Taira chased after them.