I can only use force to protect peoples' opportunities to, and perceptions of, the experience of the Gospel of Christ.  If a non-believer's life is being threatened, or if they are being tortured to the extreme, then that threat ought to be nullified, avoiding fatal resistance if at all possible.  However, should I find myself in the company of fellow, strong believers, and our lives become threatened by an attacker, I would readily allow each of us to die before I risked taking my assailant's life, because he would be the only one present whose soul is in danger.  If I encounter non-belivers killing other non-believers, I am faced with a most dire situation.  If one is clearly in self-defense and the other is clearly the initiator of fatal aggression, then I would defend the victims.  This is the lesser of two evils, fated by the would-be-killers who introduced and sealed such losses.

When children are the victims of mortal threat, or extreme torture, their perception of God's Grace, as demonstrated in the Gospel, is safely understood to be certainly manipulated and corrupted.  I would not allow a child to be killed on account of his or her saving faith in Christ, so to save his or her aggressor, as I would an adult christian... the weight of mortal threat plunges a child into a sudden, traumatic state of adulthood where he or she must attain a new, matured acceptance of his or her values (including accepting Christ's Gospel).  So, children may be defended by aggression, but, as always, I must suffer the greatest inefficiencies before that aggression is permitted to a fatal degree, regardless of what initial degree of aggression any military might command.

As I demonstrated in Question 2 of this section, killing another human-being is one of the most harmful acts there is toward souls.  Only to directly save an unbeliever or a child from certain death or extreme torture can I kill.  And so, these killings of compromise require religious investigations of involved individuals, restraint of potentially fatal aggression, and self- and friend-sacrifice of degrees not afforded by militaries or wars.