In the old warfare a man was either stabbed, shot, or thrust through after an hour or so of excitement, and all the wounded on the field were either comfortably murdered or attended to before the dawn of the next day. One was killed by human hands, with understandable and tolerable injuries. But in this war the bulk of the dead--of the western Allies, at any rate--have been killed by machinery, the wounds have been often of an inconceivable horribleness, and the fate of the wounded has been more frightful than was ever the plight of wounded in the hands of victorious savages. For days multitudes of men have been left mangled, half buried in mud and filth, or soaked with water, or frozen, crying, raving between the contending trenches. The number of men that the war, without actual physical wounds, has shattered mentally and driven insane because of its noise, its stresses, its strange unnaturalness, is enormous. Horror in this war has overcome more men than did all the arrows of Cressy. Almost all this enhanced terribleness of war is due to the novel machinery of destruction that science has rendered possible. The wholesale mangling and destroying of men by implements they have never seen, without any chance of retaliation, has been its most constant feature. You cannot open a paper of any date since the war began without reading of men burned, scalded, and drowned by the bursting of torpedoes from submarines, of men falling out of the sky from shattered aeroplanes, of women and children in Antwerp or Paris mutilated frightfully or torn to ribbons by aerial bombs, of men smashed and buried alive by shells. An indiscriminate, diabolical violence of explosives resulting in cruelties for the most part ineffective from the military point of view is the incessant refrain of this history. The increased dreadfulness of war due to modern weapons is, however, only one consequence of their development. The practicability of aggressive war in settled countries now is entirely dependent on the use of elaborate artillery on land and warships at sea. Were there only rifles in the world, were an ordinary rifle the largest kind of gun permitted, and were ships specifically made for war not so made, then it would be impossible to invade any country defended by a patriotic and spirited population with any hopes of success because of the enormous defensive capacity of entrenched riflemen not subjected to an unhampered artillery attack.