An unpleasant truth often overlooked is that although war is a great evil, it does have a great virtue: it can resolve political conflicts and lead to peace. This can happen when all belligerents become exhausted or when one wins decisively. Either way the key is that the fighting must continue until a resolution is reached. War brings peace only after passing a culminating phase of violence. Hopes of military success must fade for accommodation to become more attractive than further combat.

Since the establishment of the United Nations and the enshrinement of great-power politics in its Security Council, however, wars among lesser powers have rarely been allowed to run their natural course. Instead, they have typically been interrupted early on, before they could burn themselves out and establish the preconditions for a lasting settlement. Cease-fires and armistices have frequently been imposed under the aegis of the Security Council in order to halt fighting. NATO's intervention in the Kosovo crisis follows this pattern.

But a cease-fire tends to arrest war-induced exhaustion and lets belligerents reconstitute and rearm their forces. It intensifies and prolongs the struggle once the cease-fire ends—and it does usually end. This was true of the Arab-Israeli war of 1948-49, which might have come to closure in a matter of weeks if two cease-fires ordained by the Security Council had not let the combatants recuperate. It has recently been true in the Balkans. Imposed cease-fires frequently interrupted the fighting between Serbs and Croats in Krajina, between the forces of the rump Yugoslav federation and the Croat army, and between the Serbs, Croats, and Muslims in Bosnia. Each time, the opponents used the pause to recruit, train, and equip additional forces for further combat, prolonging the war and widening the scope of its killing and destruction. Imposed armistices, meanwhile—again, unless followed by negotiated peace accords—artificially freeze conflict and perpetuate a state of war indefinitely by shielding the weaker side from the consequences of refusing to make concessions for peace.

The Cold War provided compelling justification for such behavior by the two superpowers, which sometimes collaborated in coercing less-powerful belligerents to avoid being drawn into their conflicts and clashing directly. Although imposed cease-fires ultimately did increase the total quantity of warfare among the lesser powers, and armistices did perpetuate states of war, both outcomes were clearly lesser evils (from a global point of view) than the possibility of nuclear war. But today, neither Americans nor Russians are inclined to intervene competitively in the wars of lesser powers, so the unfortunate consequences of interrupting war persist while no greater danger is averted. It might be best for all parties to let minor wars burn themselves out.

Today cease-fires and armistices are imposed on lesser powers by multilateral agreement—not to avoid great-power competition but for essentially disinterested and indeed frivolous motives, such as television audiences' revulsion at harrowing scenes of war. But this, perversely, can systematically prevent the transformation of war into peace. The Dayton accords are typical of the genre: they have condemned Bosnia to remain divided into three rival armed camps, with combat suspended momentarily but a state of hostility prolonged indefinitely. Since no side is threatened by defeat and loss, none has a sufficient incentive to negotiate a lasting settlement; because no path to peace is even visible, the dominant priority is to prepare for future war rather than to reconstruct devastated economies and ravaged societies. Uninterrupted war would certainly have caused further suffering and led to an unjust outcome from one perspective or another, but it would also have led to a more stable situation that would have let the postwar era truly begin. Peace takes hold only when war is truly over.

A variety of multilateral organizations now make it their business to intervene in other peoples' wars. The defining characteristic of these entities is that they insert themselves in war situations while refusing to engage in combat. In the long run this only adds to the damage. If the United Nations helped the strong defeat the weak faster and more decisively, it would actually enhance the peacemaking potential of war. But the first priority of U.N. peacekeeping contingents is to avoid casualties among their own personnel. Unit commanders therefore........

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