How should the Ammonites be treated?

Do not fight against them or take their land.

And when thou comest nigh over against the children of Ammon, distress them not, nor meddle with them: for I will not give thee of the land of the children of Ammon any possession; because I have given it unto the children of Lot for a possession. Deuteronomy 2:19
Only unto the land of the children of Ammon thou camest not ... nor unto whatsoever the LORD our God forbad us. Deuteronomy 2:37

(However, we avoided the land of the Ammonites all along the Jabbok River and the towns in the hill countryall the places the LORD our God had commanded us to leave alone. v.37 from the New Living Translation)

Kill them and take their land.

So Jephthah passed over unto the children of Ammon to fight against them; and the LORD delivered them into his hands. Judges 11:32
I will cause an alarm of war to be heard in Rabbah of the Ammonites; and it shall be a desolate heap, and her daughters shall be burned with fire. Jeremiah 49:2

How should the Ammonites be treated?

Do not fight against them or take their land.

Kill them and take their land.

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