Charles Ellicott Commentary 2 Samuel 10:14

"And when the children of Ammon saw that the Syrians were fled, they likewise fled before Abishai, and entered into the city. Then Joab returned from the children of Ammon, and came to Jerusalem." — 2 Samuel 10:14 (ASV)

Came to Jerusalem. —Why the victory was not immediately followed up is not stated. Perhaps the army of Israel was too exhausted by their victory; perhaps they lacked the necessities for a siege; and perhaps the season was already too far advanced. Whatever may have been the cause, the delay gave the allies opportunity to rally.