In 1562, Motoyasu MATSUDAIRA (name changed to Ieyasu TOKUGAWA the following year) of Nishi (West) Mikawa formed Kiyosu Alliance with Nobunaga ODA, and he made his position clear to become independent from being a subsidiary of the Imagawa clan.
永禄5年（1562年）、西三河の松平元康（翌年、徳川家康に改名）は織田信長と清洲同盟を結び、今川氏の傘下から独立する姿勢を明らかにした。