If it does not accept terms of peace but makes war with you, then you are to lay siege to it.

Then the Lord said to me, “Do not harass Moab and provoke them to war, for I will not give you any of their land as your territory. This is because I have given Ar to the descendants of Lot as their possession.

But when you come close to the Ammonites, do not harass or provoke them because I am not giving you any of the Ammonites’ land as your possession; I have already given it to Lot’s descendants as their possession.

If you besiege a city for a long time while attempting to capture it, you must not chop down its trees, for you may eat fruit from them and should not cut them down. A tree in the field is not human that you should besiege it!