2 Samuel 10:13

And Joab drew nigh, and the people that were with him, unto the battle against the Syrians: and they fled before him.

Cross-reference

1 Chronicles 19:14 is the parallel account of this same battle, repeating that Joab drew near and the Syrians fled before him.

1 Chronicles 19:15 continues the parallel account, describing the Ammonites fleeing and Joab returning to Jerusalem, matching the events here.