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Moses gave the isralites war rules so they wouldn't commit acts of cruelity towards enemies

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Moses told them various things like for example when they are laying siege to a city they must not cut the fruitful trees but the ones that are not fruitful should be cut down and used as battering rams

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This takes place just before the isralites enter the promised land.

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Moses told them this somewhere outside of the promised land , cannan

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Moses gives the isralites various laws of when they are in war and what to do and how to act when they are engaged in a siege.

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The person who is reading and is telling the isralites the rules of war is moses.