Isaiah 45:1-7 – Cyrus of Persia becomes the instrument of God’s power. Cyrus, who doesn’t even know God! Yet God uses him to preserve His people and thereby glorify His name. God expands His military efforts through many kings – see prophecies in Daniel 2 and 7.
Jonah’s preaching saves the Assyrians from judgment, preserving them so that later they become the instruments of God’s hand – against Israel!
By the time of the Messiah, God no longer wields holy wars to achieve His goals. Instead, the Messiah fights His battles on a spiritual plain. Through Him, God raises up the church to engage in spiritual warfare. (The Crusades were totally misguided!) God will fight evil again, but that battle is reserved for the final judgment.