[BOOK III.]
[CHAPTER I.]
What is Lawful in War.
What is lawful in war—General Rules derived from the law of nature—Stratagems and lies—Arrangement of the following parts—First rule, all things necessary to the end lawful—Right resulting not only from the origin of a war, but from causes growing out of the same—Certain consequences justifiable, though not originally lawful—What measures are lawful against those who furnish an enemy with supplies—Stratagems—Negative—Positive—Sometimes allowable to use words in a sense different from the general acceptation—A lie according to the true notion of it injurious to the rights of others—Falsehood allowable in order to deceive children or madmen—Any one addressing another without intentions to deceive, not answerable for the misconceptions of a third person—A person not answerable for the wilful mistakes of those to whom he speaks—The fictitious threats of a person in authority—Fiction allowable in order to save the lives of the innocent, or to promote other equally important purposes—Deception lawful against an enemy, but not including promises, or oaths—To forbear using this privilege an act of generosity and Christian simplicity—Not allowable to urge others to what is unlawful for them, but not for us to do—Allowable to use the services of deserters.
I. Having, in the preceding books, considered by what persons, and for what causes, war may be justly declared and undertaken, the subject necessarily leads to an inquiry into the circumstances, under which war may be undertaken, into the extent, to which it may be carried, and into the manner, in which its rights may be enforced. Now all these matters may be viewed in the light of privileges resulting simply from the law of nature and of nations, or as the effects of some prior treaty or promise. But the actions, which are authorised by the law of nature, are those that are first entitled to attention.
II. In the first place, as it has occasionally been observed, the means employed in the pursuit of any object must, in a great degree, derive the complexion of their moral character from the nature of the end to which they lead. It is evident therefore that we may justly avail ourselves of those means, provided they be lawful, which are necessary to the attainment of any right. Right in this place means what is strictly so called, signifying the moral power of action, which any one as a member of society possesses. On which account, a person, if he has no other means of saving his life, is justified in using any forcible means of repelling an attack, though he who makes it, as for instance, a soldier in battle, in doing so, is guilty of no crime. For this is a right resulting not properly from the crime of another, but from the privilege of self-defence, which nature grants to every one. Besides, if any one has SURE and UNDOUBTED grounds to apprehend imminent danger from any thing belonging to another, he may seize it without any regard to the guilt or innocence of that owner. Yet he does not by that seizure become the proprietor of it. For that is not necessary to the end he has in view. He may DETAIN it as a precautionary measure, till he can obtain satisfactory assurance of security.
Upon the same principle any one has a natural right to seize what belongs to him, and is unlawfully detained by another: or, if that is impracticable, he may seize something of equal value, which is nearly the same as recovering a debt. Recoveries of this kind establish a property in the things so reclaimed; which is the only method of restoring the equality and repairing the breaches of violated justice. So too when punishment is lawful and just, all the means absolutely necessary to enforce its execution are also lawful and just, and every act that forms a part of the punishment, such as destroying an enemy's property and country by fire or any other way, falls within the limits of justice proportionable to the offence.
III. In the second place, it is generally known that it is not the ORIGIN only of a just war which is to be viewed as the principal source of many of our rights, but there may be causes growing out of that war which may give birth to additional rights. As in proceedings at law, the sentence of the court may give to the successful litigant other rights besides those belonging to the original matter of dispute. So those who join our enemies, either as allies or subjects, give us a right of defending ourselves against THEM also. So too a nation engaging in an unjust war, the injustice of which she knows and ought to know, becomes liable to make good all the expences and losses incurred, because she has been guilty of occasioning them. In the same manner those powers, who become auxiliaries in wars undertaken without any reasonable grounds, contract a degree of guilt and render themselves liable to punishment in proportion to the injustice of their measures. Plato approves of war conducted so far, as to compel the aggressor to indemnify the injured and the innocent.
IV. In the third place, an individual or belligerent power may, in the prosecution of a lawful object, do many things, which were not in the contemplation of the original design, and which in THEMSELVES it would not be lawful to do. Thus in order to obtain what belongs to us, when it is impossible to recover the specific thing, we may take more than our due, under condition of repaying whatever is above the real value. For the same reason it is lawful to attack a ship manned by pirates, or a house occupied by robbers, although in that ship, or that house there may be many innocent persons, whose lives are endangered by such attack.
But we have had frequent occasion to remark, that what is conformable to right taken in its strictest sense is not always lawful in a moral point of view. For there are many instances, in which the law of charity will not allow us to insist upon our right with the utmost rigour. A reason for which it will be necessary to guard against things, which fall not within the original purpose of an action, and the happening of which might be foreseen: unless indeed the action has a tendency to produce advantages, that will far outweigh the consequences of any accidental calamity, and the apprehensions of evil are by no means to be put in competition with the sure hopes of a successful issue. But to determine in such cases requires no ordinary penetration and discretion. But wherever there is any doubt, it is always the safer way to decide in favour of another's interest, than to follow the bent of our own inclination. "Suffer the tares to grow, says our divine teacher, least in rooting up the tares you root up the wheat also."