1 Chronicles 19:16-19

16Now when the Syrians saw that they had been defeated by Israel, they sent messengers and brought the Syrians who were beyond the River, and Shophach the commander of Hadadezer’s army went before them.

17When it was told David, he gathered all Israel, crossed over the Jordan and came upon them, and set up in battle array against them. So when David had set up in battle array against the Syrians, they fought with him.

18Then the Syrians fled before Israel; and David killed seven thousand charioteers and forty thousand foot soldiers of the Syrians, and killed Shophach the commander of the army.

19And when the servants of Hadadezer saw that they were defeated by Israel, they made peace with David and became his servants. So the Syrians were not willing to help the people of Ammon anymore.