When all the kings who were subject to Hadadezer saw that they had been defeated by Israel, they made peace with Israel and became subject to them. So the Arameans were afraid to help the Ammonites anymore.
KJV
And when all the kings [that were] servants to Hadarezer saw that they were smitten before Israel, they made peace with Israel, and served them. So the Syrians feared to help the children of Ammon any more.
ASV
And when all the kings that were servants to Hadarezer saw that they were put to the worse before Israel, they made peace with Israel, and served them. So the Syrians feared to help the children of Ammon any more.