After that, when Hisahide MATSUNAGA, a chief retainer of Nagayoshi MIYOSHI, advanced on Yamato Province, Ieyoshi turned to Hisahide MATSUNAGA and played an active role to capture Yamato.
その後大和に三好長慶の重臣松永久秀が進出すると松永久秀に寝返り、大和攻略戦で活躍する。