After that, as for the battle between the North and South Courts, in 1348, Doyo participated in the battle of Shijonawate it with more than 2,000 horsemen to defeat Masayuki KUSUNOKI's army, but in the battle thereafter Doyo's second son Hidemune SASAKI was killed.
その後の南北朝の戦いでは、正平(日本)3年/貞和4年（1348年）の四條畷の戦いで、道誉は二千余騎を率いて参じ、楠正行軍を撃退するが、その後の戦いで次男の佐々木秀宗が討たれる。