Deuteronomy 20:10

6 Has any man planted a vineyard and not begun to enjoy its fruit? Let him return home, or he may die in battle and another man enjoy its fruit.

7 Has any man become pledged to a woman and not married her? Let him return home, or he may die in battle and another man marry her.”

8 Then the officers shall speak further to the army, saying, “Is any man afraid or fainthearted? Let him return home, so that the hearts of his brothers will not melt like his own.”

9 When the officers have finished addressing the army, they are to appoint commanders to lead it.

10 When you approach a city to fight against it, you are to make an offer of peace.

11 If they accept your offer of peace and open their gates, all the people there will become forced laborers to serve you.

12 But if they refuse to make peace with you and wage war against you, lay siege to that city.

13 When the LORD your God has delivered it into your hand, you must put every male to the sword.

14 But the women, children, livestock, and whatever else is in the city—all its spoil—you may take as plunder, and you shall use the spoil of your enemies that the LORD your God gives you.

Read all of Deuteronomy 20