Wise woman to a commander

2 Samuel 20:14-26
A wise woman resolved the city of  Abel Beth Macah. She called from the city to speak with Joab.
'We are the peaceful and faithful in Israel. You are trying to destroy a city that is a mother in Israel. Why do you want to swallow up the Lord's inheritance?'
Joab replied, "Far be it from me! This is not the case. A men named Sheba had lifted up his hand against the king. Hand over this one man, and I'll withdraw from the city."
Then the woman went to all the people with her wise advice, and they cut off the head of Sheba son of Bicri and threw it to Joab. Joab sounded the trumpet, and his men dispersed from the city.
Note the smallest of the king's inner cabinet: this is a monarchy without a bureaucracy. Contrast Solomon's vast array of officials.
Why?
Wise woman saved her city without lost lives and properties. And they are the people Israel and it is belong to the nation of the Lord.
How?
Wise man solved battle with mouth without war!