And if he is unable,

1 Kings 20:31-32
Then the servants of Ben-hadad said to him, “Look now, we have heard that the kings of the house of Israel are merciful. Let us go out to the king of Israel with sackcloth around our waists and ropes around our heads. Perhaps he will spare your life.” / So with sackcloth around their waists and ropes around their heads, they went to the king of Israel and said, “Your servant Ben-hadad says, ‘Please spare my life.’” And the king answered, “Is he still alive? He is my brother.”

2 Chronicles 20:12
Our God, will You not judge them? For we are powerless before this vast army that comes against us. We do not know what to do, but our eyes are upon You.”

2 Chronicles 14:11
Then Asa cried out to the LORD his God: “O LORD, there is no one besides You to help the powerless against the mighty. Help us, O LORD our God, for we rely on You, and in Your name we have come against this multitude. O LORD, You are our God. Do not let a mere mortal prevail against You.”

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he will send a delegation

Judges 11:12-13
Then Jephthah sent messengers to the king of the Ammonites, saying, “What do you have against me that you have come to fight against my land?” / The king of the Ammonites answered Jephthah’s messengers, “When Israel came up out of Egypt, they seized my land, from the Arnon to the Jabbok and all the way to the Jordan. Now, therefore, restore it peaceably.”

Numbers 20:14-17
From Kadesh, Moses sent messengers to tell the king of Edom, “This is what your brother Israel says: You know all the hardship that has befallen us, / how our fathers went down to Egypt, where we lived many years. The Egyptians mistreated us and our fathers, / and when we cried out to the LORD, He heard our voice, sent an angel, and brought us out of Egypt. Now look, we are in Kadesh, a city on the edge of your territory. …

Genesis 32:3-5
Jacob sent messengers ahead of him to his brother Esau in the land of Seir, the country of Edom. / He instructed them, “You are to say to my master Esau, ‘Your servant Jacob says: I have been staying with Laban and have remained there until now. / I have oxen, donkeys, flocks, menservants, and maidservants. I have sent this message to inform my master, so that I may find favor in your sight.’”

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while the other king is still far off,

Joshua 9:6-9
They went to Joshua in the camp at Gilgal and said to him and the men of Israel, “We have come from a distant land; please make a treaty with us.” / But the men of Israel said to the Hivites, “Perhaps you dwell near us. How can we make a treaty with you?” / “We are your servants,” they said to Joshua. Then Joshua asked them, “Who are you and where have you come from?” …

Deuteronomy 20:15
This is how you are to treat all the cities that are far away from you and do not belong to the nations nearby.

Isaiah 39:3
Then the prophet Isaiah went to King Hezekiah and asked, “Where did those men come from, and what did they say to you?” “They came to me from a distant land,” Hezekiah replied, “from Babylon.”

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to ask for terms of peace.

2 Kings 18:14-16
So Hezekiah king of Judah sent word to the king of Assyria at Lachish, saying, “I have done wrong; withdraw from me, and I will pay whatever you demand from me.” And the king of Assyria exacted from Hezekiah king of Judah three hundred talents of silver and thirty talents of gold. / Hezekiah gave him all the silver that was found in the house of the LORD and in the treasuries of the royal palace. / At that time Hezekiah stripped the gold with which he had plated the doors and doorposts of the temple of the LORD, and he gave it to the king of Assyria.

Deuteronomy 20:10-12
When you approach a city to fight against it, you are to make an offer of peace. / If they accept your offer of peace and open their gates, all the people there will become forced laborers to serve you. / But if they refuse to make peace with you and wage war against you, lay siege to that city.

1 Kings 20:34
Ben-hadad said to him, “I will restore the cities my father took from your father; you may set up your own marketplaces in Damascus, as my father did in Samaria.” “By this treaty I release you,” Ahab replied. So he made a treaty with him and sent him away.

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Proverbs 20:18
Set plans by consultation, and wage war under sound guidance.

Proverbs 24:6
Only with sound guidance should you wage war, and victory lies in a multitude of counselors.

Matthew 5:25-26
Reconcile quickly with your adversary, while you are still on the way to court. Otherwise, he may hand you over to the judge, and the judge may hand you over to the officer, and you may be thrown into prison. / Truly I tell you, you will not get out until you have paid the last penny.

Matthew 10:16
Behold, I am sending you out like sheep among wolves; therefore be as shrewd as snakes and as innocent as doves.