Most people who have been thinking seriously about the maintenance of peace are tending to the opinion that a sanction of some kind is needed to enforce the observance of treaties and of agreements for arbitration. Among the measures proposed has been that of an international police force, under the control of a central council which could use it to preserve order throughout the world. At present such a plan seems visionary. The force would have to be at least large enough to cope with the army that any single nation could put into the field—under existing conditions let us say five millions of men fully equipped and supplied with artillery and ammunition for a campaign of several months. These troops need not be under arms, or quartered near The Hague, but they must be thoroughly trained and ready to be called out at short notice. Practically that would entail yearly votes of the legislative bodies of each of the nations supplying a quota; and if any of them failed to make the necessary appropriation there would be great difficulty in preventing others from following its example. The whole organization would, therefore, be in constant danger of going to pieces. [Sidenote: The U. S. and the international police.] But quite apart from the practical difficulties in the permanent execution of such a plan, let us see how it would affect the United States. The amount of the contingents of the various countries would be apportioned with some regard to population, wealth, and economic resources; and if the total were five million men, our quota on a moderate estimate might be five hundred thousand men. Is it conceivable that the United States would agree to keep anything like that number drilled, equipped, and ready to take the field on the order of an international council composed mainly of foreign nations? Of course it will be answered that these figures are exaggerated, because any such plan will be accompanied by a reduction in armaments. But that is an easier thing to talk about than to effect, and especially to maintain. One must not forget that the existing system of universal compulsory military service on the continent of Europe arose from Napoleon’s attempt to limit the size of the Prussian army. He would be a bold or sanguine man who should assert that any treaty to limit armaments could not in like manner be evaded; and however much they were limited, the quantity of troops to be held at the disposal of a foreign council would of necessity be large, while no nation would be willing to pledge for the purpose the whole of its military force. Such a plan may be practicable in some remote future when the whole world is a vast federation under a central government, but that would seem to be a matter for coming generations, not for the men of our day. Moreover, the nations whose troops were engaged in fighting any country would inevitably find themselves at war with that country.