13 Then Joab and the troops with him advanced to fight the Arameans, and they fled before him.

Read 2 Samuel 10:13 Using Other Translations

And Joab drew nigh, and the people that were with him, unto the battle against the Syrians: and they fled before him.
So Joab and the people who were with him drew near to battle against the Syrians, and they fled before him.
When Joab and his troops attacked, the Arameans began to run away.