Deuteronomy 20:10-20

10 When thou comest nigh to a city to fight against it, then proclaim peace to it.
11 And it shall be, if it shall make thee answer of peace, and open to thee, then it shall be, [that] all the people [that are] found therein, shall be tributaries to thee, and they shall serve thee.
12 And if it will make no peace with thee, but will make war against thee, then thou shalt besiege it:
13 And when the LORD thy God hath delivered it into thy hands, thou shalt smite every male of it with the edge of the sword:
14 But the women, and the little ones, and the cattle, and all that is in the city, [even] all the spoil of it, shalt thou take to thyself: and thou shalt eat the spoil of thy enemies, which the LORD thy God hath given thee.
15 Thus shalt thou do to all the cities [which are] very distant from thee, which [are] not of the cities of these nations.
16 But of the cities of these people which the LORD thy God doth give thee [for] an inheritance, thou shalt save alive nothing that breatheth:
17 But thou shalt utterly destroy them, [namely], the Hittites, and the Amorites, the Canaanites, and the Perizzites, the Hivites, and the Jebusites, as the LORD thy God hath commanded thee:
18 That they may not teach you to do after all their abominations which they have done to their gods; so would ye sin against the LORD your God.
19 When thou shalt besiege a city a long time in making war against it to take it, thou shalt not destroy the trees of it by forcing an ax against them; for thou mayest eat of them: and thou shalt not cut them down (for the tree of the field [is] man's [life]) to employ [them] in the siege:
20 Only the trees which thou knowest that they [are] not trees for food, thou shalt destroy and cut them down; and thou shalt build bulwarks against the city that maketh war with thee, until it shall be subdued.
The Webster Bible is in the public domain.