2 Samuel 10:7-14

When David heard about it, he sent Joab and the entire army, the strong and brave men. The Ammonites came out and lined up for battle at the entrance of the [city] gate, but the Arameans of Zobah and Rehob and the men of Tob and Maacah were [stationed] by themselves in the field. Now when Joab saw that the battlefront was against him in front and in the rear, he selected some of all the choice men in Israel and set them in battle formation to meet the Arameans (Syrians). But he placed the rest of the men in the hand of his brother Abishai, and he placed them in battle formation to meet the Ammonites. Joab said [to Abishai], “If the Arameans are too strong for me, then you shall help me; but if the Ammonites are too strong for you, I will come to help you. Be courageous, and let us show ourselves courageous for the benefit of our people and the cities of our God. And may the LORD do what is good in His sight.” So Joab and the people who were with him approached the battle against the Arameans, and they fled before him. When the Ammonites saw that the Arameans had fled, they also fled before Abishai and entered the city. So Joab returned from battling against the Ammonites and came to Jerusalem.