St. Augustin, in defining those to be just wars, which are made to avenge injuries has taken the word avenge in a general sense of removing and preventing, as well as punishing aggressions. This appears to be his meaning from the following sentence of the passage, in which he does not enumerate the particular acts, which amount to injury, but adds, by way of illustration, that "the state or nation, which has neglected to punish the aggressions of its own subjects, or to make reparation for the losses occasioned by those aggressions, is a proper object of hostility and attack." Prompted by this natural knowledge of right and wrong, the Indian King, as we are informed by Diodorus, accused Semiramis of having commenced war against him without having received any injury. Thus the Romans expostulated with the Senones, that they ought not to attack a people who had given them no provocation. Aristotle in the second book and second chapter of his Analytics, says, war generally is made upon those who have first done an injury. Quintus Curtius describes the Abian Scythians, as the best acquainted with the principles of justice of any of the Barbarians. For they declined having recourse to arms, unless provoked by aggression. A just cause then of war is an injury, which though not actually committed, threatens our persons or property with danger. III. It has already been proved that when our lives are threatened with immediate danger, it is lawful to kill the aggressor, if the danger cannot otherwise be avoided: an instance, as it has been shewn, on which the justice of private war rests. We must observe that this kind of defence derives its origin from the principle of self-preservation, which nature has given to every living creature, and not from the injustice or misconduct of the aggressor. Wherefore though he may be clear of guilt, as for instance a soldier in actual service, mistaking my person for that of another, or a madman in his frenzy, or a man walking in his sleep, none of these cases deprive me of the right of self-defence against those persons. For I am not bound to submit to the danger or mischief intended, any more than to expose myself to the attacks of a wild beast. IV. It admits of some doubt, whether those, who unintentionally obstruct our defence, or escape, which are necessary to our preservation, may be lawfully maimed or killed. There are some, even Theologians, who think they may. And, certainly if we look to the law of nature alone, according to its principles, our own preservation should have much more weight with us, than the welfare of society. But the law of charity, especially the evangelical law, which has put our neighbour upon a level with ourselves, does not permit it.