2 Samuel 10:17-21

Now when it was reported to David, he gathered all Israel together and crossed the Jordan, and came to Helam. And the Arameans lined up against David and fought him.

But the Arameans fled from Israel, and David killed seven hundred charioteers of the Arameans and forty thousand horsemen, and struck Shobach the commander of their army, and he died there.

When all the kings, servants of Hadadezer, saw that they had been defeated by Israel, they made peace with Israel and served them. So the Arameans were afraid to help the sons of Ammon anymore.