1 Chronicles 19:18-19

The Arameans fled before Israel, and David killed of the Arameans 7,000 charioteers and 40,000 foot soldiers, and put to death Shophach the commander of the army. So when the servants of Hadadezer saw that they were defeated by Israel, they made peace with David and served him. Thus the Arameans were not willing to help the sons of Ammon anymore.