 In 1636, he participated in the defense against the Second Manchu invasion of Korea, credited with the death of some 500 Qing troops at the battle of Ssangnyeong.After Joseon's surrender to the Manchus, Kim retired from military life, moving to Daegu where he married the daughter of the "mok" commander Jang Chun-jeom (장춘점 / 張春點).They settled in present-day Urok-ri, Gachang-myeon, Dalseong-gun.