Deuteronomy 20:11 BBE

⁹  Then, after saying these words to the people, let the overseers put captains over the army.

¹⁰  When you come to a town, before attacking it, make an offer of peace.

¹¹  And if it gives you back an answer of peace, opening its doors to you, then all the people in it may be put to forced work as your servants.

¹²  If however it will not make peace with you, but war, then let it be shut in on all sides:

¹³  And when the Lord your God has given it into your hands, let every male in it be put to death without mercy.