1 Chronicles 19:7-15

⁷ They hired thirty-two thousand chariots and the king of Maacah with his army, who came and camped before Medeba. And the Ammonites were mustered from their cities and came to battle. ⁸ When David heard of it, he sent Joab and all the army of the warriors. ⁹ The Ammonites came out and drew up in battle array at the entrance of the city, and the kings who had come were by themselves in the open country. ¹⁰ When Joab saw that the line of battle was set against him both in front and in the rear, he chose some of the picked men of Israel and arrayed them against the Arameans; ¹¹ the rest of his troops he put in the charge of his brother Abishai, and they were arrayed against the Ammonites. ¹² He said, "If the Arameans are too strong for me, then you shall help me; but if the Ammonites are too strong for you, then I will help you. ¹³ Be strong, and let us be courageous for our people and for the cities of our God; and may the Lord do what seems good to him." ¹⁴ So Joab and the troops who were with him advanced toward the Arameans for battle; and they fled before him. ¹⁵ When the Ammonites saw that the Arameans fled, they likewise fled before Abishai, Joab's brother, and entered the city. Then Joab came to Jerusalem.