1 Chronicles 19:10-15

10When Joab saw that the battle would be fought on two fronts, he chose some of Israel’s best men and deployed them against the Arameans.

11He put his brother Abishai in charge of the rest of the army and they were deployed against the Ammonites.

12Joab said, “If the Arameans start to overpower me, you come to my rescue. If the Ammonites start to overpower you, I will come to your rescue.

13Be strong! Let’s fight bravely for the sake of our people and the cities of our God! The Lord will do what he decides is best!”

14So Joab and his men marched toward the Arameans to do battle, and they fled before him.

15When the Ammonites saw the Arameans flee, they fled before Joab’s brother Abishai and withdrew into the city. Joab went back to Jerusalem.