2 Samuel 10:14

And when the children of Ammon saw that the Syrians were fled, then fled they also before Abishai, and entered in to the city, they retired into their fortifications. So Joab returned from the children of Ammon, and came to Jerusalem. His was a brilliant exploit, but not a decisive defeat of the Syrians. The siege of Rabbah he did not undertake, either because the season was too far advanced, or because he did not have the materials for such a siege. Both Joab and Abishai, trusting in the God of Israel, had done their duty, for a just war may well be carried on by believers.