1396. Is it possible that the cause of war should be just on both sides? (a) Materially or objectively, the cause of war is just only on one side, for, if one nation has the right to demand satisfaction or restitution, manifestly the other nation has no right to refuse or resist. (b) Formally or subjectively, the cause of war is just only on one side, if the facts and obligations are known to both disputants, for the nation that knows the right of the other side and yet opposes it, does not act in good faith. (c) Formally or subjectively, the cause of war is just on both sides, if the nation that is objectively in the wrong is subjectively persuaded that it is in the right. And, even though a government is in bad faith, its people as a rule will be in good faith as a result of not understanding the facts or merits of the controversy.
1397. It is possible that there should be objective justice and injustice on the same side. (a) Thus, the side which is just as regards the cause of the war, may be unjust in its conduct of the war on account of the unlawful means it employs to win, or its continuation of a hopeless struggle. (b) The side which was just as regards the original cause of the war, may be unjust as regards a new cause that appears. Thus, a nation which goes to war to regain a lost territory, but which continues to fight for the sake of conquest after the legitimate end has been achieved, contends for a just cause at the beginning, but for an unjust cause later on. (c) The side whose grounds are justifiable from the immediate point of view may be in the wrong if causes are traced farther back.
1398. What are the duties before the beginning of war, according to natural law?
(a) Examination of the Cause of War.—It is clear that those charged with the declaration of war are bound to examine diligently and prayerfully into the dispute, weighing the reasons on both sides, and asking light from on high. To this end they should seek the counsel, not of a few, but of many—not merely among those who are experts in the diplomatic, legal, economic, and military aspects of the question, but also among those who will look at the matter from its ethical side and who are guided by fairness and justice. Since it is the people who have to bear the burdens of war, it seems that many wars in the past would have been prevented, had the wishes of the people been consulted.
(b) Judgment about the Merits of the Controversy.—It is also clear that those who have to decide for war or peace should be impartial in their judgment. Hence, they have to be on their guard against jingoism, yellow journalism, and war interests, as well as against the pacifist or the favorer of a foreign country at the expense of his own. They should not proceed to offensive war, if their cause remains doubtful, unless the other side provokes war by refusing peaceful settlement; but, if they are in possession, they have the right to make defensive war.
(c) Judgment about the Feasibility of War.—Prudence demands that, even when a nation is convinced that it has a just cause to make war, it should nevertheless refrain from this, unless it has a well-grounded expectation that war will improve matters (Luke, xiv. 31, 32). Statesmen who plunge their people into adventures whose end they cannot at all foresee, are criminals.
(d) Efforts at Peaceful Solution.—Even if the cause is just and the war feasible, hostilities should not be resorted to except as a last means. Hence, pacific means—such as direct negotiation, mediation, arbitration, judicial settlement, or pressure through trade embargoes, boycotts, breach of diplomatic intercourse, etc.—should be tried in the first place.
1399. The Chief Duties before Beginning War, According to International Law.—(a) Before war is declared, an ultimatum should be issued to the other nation, offering it final terms and a last opportunity to make apology or satisfaction. (b) Foreigners who are in one’s territory should be given an opportunity to settle their affairs and leave the country within a reasonable time. (c) Ambassadors and other representatives of the enemy should be provided with passports.
1400. In itself, as said above (see 1380 sqq.), war is not unlawful. But in the light of the conditions required for a just war and of circumstances as they are today, can war at the present time be ever justifiable? (a) If the supreme interests of a nation are at stake (such as its independence, the policies or interests vital to its existence, its obligations under covenant or treaty of peace), war can still be lawful today, for a nation cannot surrender its right to self-defense, or betray its solemn engagements of cooperative defense. (b) If less than supreme interests are at stake, war today seems unjustifiable, for what proportion is there between the minor interests of a single or several nations and the enormous destruction of modern war and the dislocation of international security? Efforts of statesmen to secure a world pact, outlawing or renouncing war as a means of national policy, indicates progress for this view.
1401. What are the duties during war? (a) One should use every lawful means, according to one’s position, to secure victory for one’s country. Fighting to gain only a “stalemate,” in itself, is immoral. (b) One should avoid such means as are opposed to natural or international law.