Absolutist restrictions in warfare appear to be of two types: restrictions on the class of persons at whom aggression or violence may be directed and restrictions on the manner of attack, given that the object falls within that class. These can be combined, however, under the principle that hostile treatment of any person must be justified in terms of something about that person which makes the treatment appropriate. Hostility is a personal relation, and it must be suited to its target. One consequence of this condition will be that certain persons may not be subjected to hostile treatment in war at all, since nothing about them justifies such treatment. Others will be proper objects of hostility only in certain circumstances, or when they are engaged in certain pursuits. And the appropriate manner and extent of hostile treatment will depend on what is justified by the particular case.