In December of that year, with advice from Prince Okiyo, Masakado advanced his army and occupied the provincial offices of Shimotsuke and Kouzuke, where he conducted unilateral jimoku (appointment ceremonies) and appointed Kokushis (provincial governors) for each province of Kanto.
興世王の進言に従い将門は軍を進め、同年12月、下野国、上野国の国府を占領、独自に除目を行い関東諸国の国司を任命した。