After "Osaka Natsu no Jin" (the Summer Siege of Osaka), Masamune had to abandon his ambition of conquering Japan, especially after seeing the decline and forfeiture of Tadateru MATSUDAIRA (the 6th son of Ieyasu and the husband of the daughter of Masamune, Irohahime); Masamune began to follow Ieyasu with respect by recognizing his wish for the peace and the security of the nation; he put in his efforts to the management of his territory.
大坂夏の陣後には天下安泰を願う家康に心服し、松平忠輝の改易などもあり天下取りの野望をあきらめざるをえず、領国経営に努めたようだ。