1 Chronicles 19:11-15

But the remainder of the people he placed under the command of Abshai his brother; and they lined up against the sons of Ammon.

He said, “If the Arameans are too strong for me, then you shall help me; but if the sons of Ammon are too strong for you, then I will help you.

Be strong, and let’s 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 advanced to battle against the Arameans, and they fled from him.

When the sons of Ammon saw that the Arameans had fled, they also fled from his brother Abshai and entered the city. Then Joab came to Jerusalem.