What does 2 Samuel 20:22 mean?

The woman went to the people with her wise advice. They cut off Sheba's head and threw it to Joab. Joab blew the trumpet, and his men left the city and went home. Joab returned to Jerusalem to see the king. 2 Samuel 20:22 - Modern Text Bible

(The city follows the woman's plan, ending the crisis by handing over Sheba. Joab calls off the attack and returns to David.)