In the same year, Masamune intervened in the family conflict of Osaki clan by invading the territory of Osaki clan with 10,000 soldiers, but Masamune was defeated due to the stiff resistance of Osaki clan, the betrayal of his ally Haruuji KUROKAWA, and the weather condition during the battle with a heavy snow.
同年、北方の大崎氏家中の内紛に介入、兵1万を以て攻め入ったものの大崎氏の頑強な抵抗、及び味方であった黒川晴氏の裏切りと大雪により敗北。