1 Chronicles 19:13

9 The Ammonites marched out and arrayed themselves for battle at the entrance to the city, while the kings who had come stayed by themselves in the open country.

10 When Joab saw the battle lines before him and behind him, he selected some of the best men of Israel and arrayed them against the Arameans.

11 And he placed the rest of the forces under the command of his brother Abishai, who arrayed them against the Ammonites.

12 “If the Arameans are too strong for me,” said Joab, “then you will come to my rescue. And if the Ammonites are too strong for you, then I will come to your rescue.

13 Be strong and let us fight bravely for our people and for the cities of our God. May the LORD do what is good in His sight.”

14 So Joab and his troops advanced to fight the Arameans, who fled before him.

15 When the Ammonites saw that the Arameans had fled, they too fled before Joab’s brother Abishai, and they entered the city. So Joab went back to Jerusalem.

16 When the Arameans saw that they had been defeated by Israel, they sent messengers to bring more Arameans from beyond the Euphrates, with Shophach the commander of Hadadezer’s army leading them.

17 When this was reported to David, he gathered all Israel, crossed the Jordan, advanced toward the Arameans, and arrayed for battle against them. When David lined up to engage them in battle, they fought against him.

Read all of 1 Chronicles 19