Although the Watanabe Party members in Mikawa worked well for the Matsudaira clan for generations, they, as the followers of Jodo Shinshu (the True Pure Land Sect of Buddhism), rebelled against Ieyasu MATSUDAIRA (Ieyasu TOKUGAWA) when the Mikawa Ikko Ikki (an uprising of Ikko sect followers in Mikawa Province) broke out, and many members of the party died in the battle.
三河の渡辺党は松平氏に代々仕えて功があったが、浄土真宗の門徒であったために三河一向一揆で松平家康（徳川家康）に反旗を翻し、一族の者が多く戦死した。