1 Chronicles 19:16-19

16When the Arameans (Syrians) saw that they had been defeated by Israel, they sent messengers and brought out the Arameans who were beyond the [Euphrates] River, with Shophach the commander of the army of Hadadezer leading them.

17When this was told to David, he gathered all Israel and crossed the Jordan, and came upon them and drew up in formation against them. So when David drew up in battle array against the Arameans, they fought against him.

18But 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.

19When the servants of Hadadezer saw that they had been defeated by Israel, they made peace with David and became subject to and served him. And the Arameans (Syrians) were not willing to help the Ammonites anymore.