15 When the Ammonites realized that the Arameans were fleeing, they too fled before his brother Abishai and went inside the city. So Joab went back to Jerusalem.

Read 1 Chronicles 19:15 Using Other Translations

And when the children of Ammon saw that the Syrians were fled, they likewise fled before Abishai his brother, and entered into the city. Then Joab came to Jerusalem.
And when the Ammonites saw that the Syrians fled, they likewise fled before Abishai, Joab's brother, and entered the city. Then Joab came to Jerusalem.
And when the Ammonites saw the Arameans running, they also ran from Abishai and retreated into the city. Then Joab returned to Jerusalem.