It is mere illusion and pretty sentiment to expect much from mankind if he forgets how to make war. And yet no means are known which call so much into action as a great war, that rough energy born of the camp, that deep impersonality born of hatred, that conscience born of murder and cold-bloodedness, that fervor born of effort of the annihilation of the enemy, that proud indifference to loss, to one's own existence, to that of one's fellows, to that earthquake-like soul-shaking that a people needs when it is losing its vitality.