And all the spoil of these cities, and the cattle, the children of Israel took for a prey unto themselves; but every man they struck with the edge of the sword, until they had destroyed them, neither left they any that breathed.
All Commentaries on Joshua 11:14 Go To Joshua 11
Augustine of Hippo
AD 430
One should not at all think it a horrible cruelty that Joshua did not leave anyone alive in those cities that fell to him, for God himself had ordered this. However, whoever for this reason thinks that God himself must be cruel and does not wish to believe then that the true God was the author of the Old Testament judges as perversely about the works of God as he does about the sins of human beings. Such people do not know what each person ought to suffer. Consequently, they think it a great evil when that which is about to fall is thrown down and when mortals die.