In 1337, Takatsune attacked Kanagasaki-jo Castle (Tsuruga City, Fukui Prefecture) of the Southern Court in Echizen with KO no Moroyasu and defeated Yoshisada and his son Yoshiaki NITTA who had both Imperial Princes on their side.
延元2年/建武4年（1337年）に、越前で高師泰と共に南朝方の金ケ崎城（福井県敦賀市）を攻め、両親王を擁した義貞、新田義顕親子を破る。