First they took control of most of their former territories in Izumo Province by destroying Shinyama-jo Castle and advanced unresisted to attack Gassantoda-jo Castle, but the castle was so tightly guarded by Takashige AMANO, making it inaccessible and impregnable, that they had problems destroying the castle, despite the castle only being guarded by three hundred warriors.
最初に新山城を陥落させ、出雲国の旧領をほぼ制圧し、破竹の勢いで月山富田城に向かったが、守兵300であるにも関わらず天野隆重が守る難攻不落の険城をなかなか落とすことができなかった。