From his early years, Tsunashige was excellent at military prowess; he never failed to purify his body to pray for a victory to Hachiman Daibosatsu (great bodhisattva) on 15th of every month.
綱成は若い頃から武勇に秀で、毎月15日は必ず身を清めて八幡大菩薩に戦勝を祈願したといわれている。