Since 1795, when Immanuel Kant published in his old age his treatise on "Perpetual Peace", many have considered it an established fact that war is the destruction of all good and the origin of all evil. In spite of all that history teaches, no conviction is felt that the struggle between nations is inevitable, and the growth of civilization is credited with a power to which war must yield. But, undisturbed by such human theories and the change of times, war has again and again marched from country to country with the clash of arms, and has proved its destructive as well as creative and purifying power. It has not succeeded in teaching mankind what its real nature is. Long periods of war, far from convincing men of the necessity of war, have, on the contrary, always revived the wish to exclude war, where possible, from the political intercourse of nations.