Yoshikane, who was the father-in-law of Masakado and his sponsor, could not turn a blind eye to this, and in June, 936, Yoshikane fought against Masakado at the border of Shimotsuke Province along with Yoshimasa and the son of Kunika, TAIRA no Sadamori, but they were defeated.
将門の岳父でありいわば親権者でもある良兼も放っておけず、承平6年（936年）6月、良兼は良正や国香の子平貞盛らと共に下野国境にて将門と対戦するが敗れた。