On the so called Kanegazaki no nokiguchi (withdrawal from Kanegazaki) in 1570, it is said that Narimasa also participated in the army of the lord, leading a few armed forces of horse guards with Hiromasa YANADA and Masakane CHUJYO and worked to support Hideyoshi using firearms troop.
元亀元年1570年の俗に言う金ヶ崎の退き口では、梁田広正・中条将艦らと共に、僅かな兵力である馬廻り衆を率いて、成政も殿の軍に参加し、鉄砲隊を用いて秀吉軍を救援し活躍したとされる。