Halakhah su Deuteronomio 20:12

That is that He commanded us the law that He gave to us in a war with the other nations; and that is called an optional war. And we are commanded about this when we fight with them: That we promise them, only their lives, if they make peace with us and give us the land; and we obligate them to give us taxes. And we do not listen to them until they accept all of it upon themselves. And that is that they give us a set [amount] each year - according to that which the king decrees it should be at that time - that they be under his control, that they lower themselves and they humble themselves. And this is the content of subjugation. But if they don't make peace with us, we have been commanded to kill every male adult in that province and to take everything they have and the women. And that is His saying, "And if they do not make peace with you, etc." (Deuteronomy 20:12). And all of this comes under the definition of an optional war. And the regulations of this commandment have already been explained in the eighth [chapter] of Sotah and the second [chapter] of Sanhedrin. (See Parashat Shoftim; Mishneh Torah, Kings and Wars 6).