Thematic Bible: Sent joab against the armies of, hired by the ammonites

When the children of Ammon saw that they were become odious to David, the children of Ammon sent and hired the Syrians of Beth Rehob, and the Syrians of Zobah, twenty thousand footmen, and the king of Maacah with one thousand men, and the men of Tob twelve thousand men. When David heard of it, he sent Joab, and all the army of the mighty men. The children of Ammon came out, and put the battle in array at the entrance of the gate: and the Syrians of Zobah and of Rehob, and the men of Tob and Maacah, were by themselves in the field. read more.
Now when Joab saw that the battle was set against him before and behind, he chose of all the choice men of Israel, and put them in array against the Syrians: The rest of the people he committed into the hand of Abishai his brother; and he put them in array against the children of Ammon. He said, "If the Syrians are too strong for me, then you shall help me; but if the children of Ammon are too strong for you, then I will come and help you. Be courageous, and let us be strong for our people, and for the cities of our God; and Yahweh do that which seems good to him." So Joab and the people who were with him drew near to the battle against the Syrians: and they fled before him. When the children of Ammon saw that the Syrians had fled, they likewise fled before Abishai, and entered into the city. Then Joab returned from the children of Ammon, and came to Jerusalem.