On January 22, 938, Yoshikane bought off HASETSUKABE no Koharumaru who was a crier serving Masakado, to get inside information about the camp in Iwai City and made a night attack, but he was anticipated and was counterattacked into a rout.
良兼は12月14日将門の駈使である丈部子春丸を買収して岩井市の営所の内情を探り夜襲をかけるも察知され逆襲を受け敗走。