The following year, when a confrontation arose between FUJIWARA no Haruaki, a powerful regional clan in Hitachi Province, and FUJIWARA no Korechika, the Hitachi no suke (Assistant Governor of Hitachi Province), Masakado, assisting Haruaki, attacked the Hitachi provincial office and occupied it.
翌年、常陸国の豪族藤原玄明と常陸介藤原維幾が対立し、玄明に助力した将門は常陸国府を襲撃、国府を占領した。