Sadahisa, who was fighting in Kyoto at the time, found the crisis of his main domain and ordered his first son of concubine Yorihisa KAWAKAMI and Hisanaga's son Munehisa SHIMAZU to return to the domain to attack the Soutnern Court.
当時京都で戦っていた貞久は本領の危機を知り長庶子の川上頼久・久長の子である島津宗久を急ぎ帰国させ、南朝方討伐に向かわせる。