'Kings' in the Bible

When all the kings who were allied with Hadadezer saw that they had been defeated by Israel, they sought terms of peace with the Israelis and became subservient to them. Furthermore, the Arameans were afraid to help the Ammonites anymore.

One spring day, during the time of year when kings go off to war, David sent out Joab, along with his personal staff and all of Israel's army. They utterly destroyed the Ammonites and then attacked Rabbah while David remained in Jerusalem.