Masanori, who was regarded as the most important commander contributed to the victory of the Eastern Camp, also actively worked to seize the Osaka-jo Castle from Terumoto Mori who was the supreme commander of the Western Camp, thus he was rewarded after the war with the Hiroshima Domain, Aki Province and Hiroshima Domain, Bingo Province worth as much as 498,200 koku.
こうして東軍の勝利に貢献第一と目された正則は西軍総大将・毛利輝元からの大坂城接収にも奔走し、戦後安芸国広島藩と備後国広島藩49万8200石の大封を得た。