Pray and ask the Lord to make right decision

1 Kings 20:31-34
Ben-Hadad fled to the city and hid in an inner room. His officials said to him, "We heard the kings of the house of Israel are merciful. Let us go to the king of Israel with sackcloth around our waists and ropes around our heads. Perhaps he will spare your life."
The king said " Is he still alive? He is my brother."
"I will return the cities my father took fro your father," Ben-Hadad offered."You may set up your own market areas in Damascus, as my father did in Samaria."
Aha agreed and make a treaty with him and let his go.
Why?
Ahab looked Ben-Hadad as brother, even he was enemy and be defeated. Ahab was condemned by the prophet of the Lord later.
It is the help of the Lord let Ahab defeated Ben-Hadad. Not Ahab his own strength, so he should ask the Lord.
Merciful to people is good deed but should not merciful to our enemy, especial to the chief of the enemy. Just is needed to our enemy. It is hard to make decision under these situation. Ask the Lord will be the best way.
How?
No matter what we will do pray to the Lord, he will give us the wisdom and show us his way to follow Him. To be a servant of the Lord we should ask the Master before make decision.