2 Samuel 10:13-14

13Then Joab and his group of soldiers went to fight against the Syrians. As they marched towards the Syrian soldiers, they ran away.

14The Ammonites saw that the Syrians were running away from Joab. So they also ran away from his brother Abishai's men. They ran back into their city. So Joab stopped fighting the Ammonites. He returned to Jerusalem with his army.