In my opinion, the further intensive development of gas warfare, such as would have accompanied, say, the doubling or quadrupling of the German factory output, would have forced us into realising the limit of this collective protection. It would have compelled us to immobilise, in these shelters, more men than was consistent with the safety of the zone in question. Undoubtedly, the future of collective protection lies in some form which will leave the soldier his combatant powers, in other words some mobile form. This has already been forecasted by Colonel Fuller in his book on Tanks in the Great War. But he passes lightly over the protection of the tank against gas. With the increase in depth of infected zones, through the increasingly lethal nature of the persistent compound, the tank will he compelled to rely on filtration methods of protection, instead of the use of compressed oxygen in a gas-tight compartment. Once committed to the use of oxygen, the only safe procedure will be to close up the tank and employ the oxygen while there is any suspicion of the presence of gas, and, under these conditions, oxygen transport would become a factor militating against the prime purpose of the tank, the transport of troops and arms. It is safe to forecast a tense struggle between chemical weapons and protective tank devices in the event of future wars.
Conclusion.—The facts which we have surveyed in early chapters, and the development foreshadowed above, form part of a much wider subject, for they are but one aspect of scientific warfare. In what main directions has science modified or revolutionised modern war? Its influence has touched practically every weapon in manufacture or design, introducing profound modifications in many cases. The sum total of such changes may be claimed to have revolutionised warfare, but the term revolution should be reserved, for some more specific scientific innovation, which threatens to change the nature of war rather than merely improve existing weapons. Modern wars have all echoed the popular cry for some new scientific principle or device to settle hostilities with one sharp stroke. This conception has been the sport of writers of fiction and others for many years. The "electric" death-dealing ray, the all-powerful gas, the deadly bacteria, and the "explosion" wave have all shared in buoying up the hopes or quickening the fears of warring peoples. Contrary to popular supposition, a decisive scientific military surprise of this nature is not likely to follow close on the heels of the discovery of a new phenomenon. It is more than eighty years since the mind of a Faraday delved so fruitfully into electrical science, yet the oft prophesied large scale direct use of high voltage electricity, or some other form in war has not materialised. Organic chemistry was a well-founded branch of science early in the nineteenth century, and flourishing industries, fostered by it, were in existence thirty years ago, yet it was not until the early twentieth century, and the recent war, that we witnessed the rapid growth of organic chemical warfare, which, I claim, was as revolutionary as any other war development. The physical sciences, have left their mark on every weapon and mechanical appliance, and the cumulative effect of these changes is indeed large, but the most revolutionary upheaval in warfare, with permanent results, came from chemistry. The flexible nature of organic chemistry must not be lost sight of. In the physical sciences, electricity, for example, years of co-ordinated world progress are required to produce an epoch-making discovery which might have critical and direct war significance. Radioactivity has shown us what undreamt-of energy is bound up in the atom, and many are the prophesies regarding the harnessing of these forces for constructive activities. At least one prominent novelist has pictured their destructive use in the radioactive bomb. But the use of this wonderful store of energy for peace and war can only result from years of costly and voluminous research, and we have no idea of the difficulties involved in production, without which any invention, however telling and revolutionary, has no incidence on war. But in organic chemistry a single worker, following up some rare family of compounds, may stumble upon a substance pot far removed chemically from related compounds yet infinitely more potent for war. Mustard gas, or B:B dichlordiethylsulphide, is a member of a group of compounds differing only slightly in chemical structure the one from the other. Yet its nearest chemical relative is comparatively harmless. The persistent lethal compound which will vastly change the nature of warfare will probably be but a slight chemical modification of some harmless substance, Thus, by comparison with other branches of science as the handmaids of war, organic chemistry is sympathetic, flexible, and theoretically capable of yielding revolutionary discoveries in a relatively short time. We can only base such speculations on general grounds. Circumstances may disprove our contention over a short historical period, but it will be borne out in the long run. This is not the only reason, however, for the unique war importance of organic chemicals. It so happens that many of them are essential to our daily life, as dyes, drugs, photographic and other synthetic products. Industries, therefore, have arisen for their manufacture. And this is not all. Organic chemical factories have proved to be not only arsenals in disguise but endowed with the flexibility of their parent, the science itself. The factories and plants ignore the war significance of the problems put to them. They can develop the production of practically any chemical which research can produce. The will of man can thus silently and swiftly convert the dye factory into an arsenal.
These inherent possibilities of organic chemistry, flexibility in research and production, make chemical warfare the most important war problem in the future reconstruction of the world.
CHAPTER XI
HUMANE OR INHUMANE?
A good deal of abuse has been showered on chemical warfare methods by those who understand very little about them. It has been claimed by such that gas is particularly atrocious. Feeling on the matter has been so strong in certain quarters that the fact that all war is particularly vile and atrocious seems to have been completely lost sight of. Let us take up this matter in a rational way. In the first place, what do we mean by the atrocity or inhumanity of a weapon? We can either appeal to the imagination or the reason, in the first case, by visualising the battlefields, or, in the second, by making a cold analysis of the casualties caused by gas.
Nature of Gas Casualties.—Every normal person who experienced and survived the throes of the different stages of the war, and of the different gas surprises, mainly German, which were sprung upon us, finds it difficult to think out, or express, a cool and balanced view on the question of poison gas. But such a balanced view is most important for the future. It must be remembered that the official protests in 1915 arose on the grounds, to use Lord Kitchener's words, that "they employed these poisonous methods to prevail when their attack, according to the rules of war, might have otherwise failed." Had the rules of war permitted their use, we should, no doubt, have been protected. But these protests, submerged in popular sentiment, became an outcry against the atrocity of the new weapon. This, a just criticism at the time, became inaccurate when the Allies reacted, methods of protection developed, and the specific tactical uses of gas were realised. The view of the peculiar atrocity of gas has outlived the truth of war experience with regard to it. We agree that chemical warfare is atrocious. But it is no exception, for thus are all the aggressive methods of warfare. Indeed, when we attempt to interpret atrocity in terms of available casualty statistics, we find that gas is slightly less atrocious than the other weapons. We must either incline to this view or dispute the figures, which are authoritative. Consider the American figures. These will he more truly representative than our own, because their troops were only exposed during the later and more developed phases of the war. Of the total strength of the A.E.F., the number gassed was about six per cent., wounded by rifle and machine-gun fire about one per cent., wounded by high explosive one and a half per cent., shrapnel wounds three percent., and bayonet wounds less than one half per cent. But although enemy gas caused more than 70,000 casualties, yet of these only one and a half per cent. were fatal, while the total number of deaths for all types of casualties was thirty per cent. Thus against the American army, measured by casualties produced, gas was by far the most effective, and yet by far the least deadly weapon. What can be more atrocious than the actual cone of tens or even hundreds of dead and wounded invariably left before an untouched machine-gun emplacement in an assault? What is more horrible than the captured first line trench after its treatment by the preparatory bombardment, or the mutilation of men peacefully sleeping in billets behind the battle front and thrown, broken and bloody, through their billet walls under the wheels of passing transport, as one has seen them?
The whole experience of real war is beyond adjectives. But, leaving impressions, let us turn to facts. With regard to the future and from the point of view of atrocity, gas has a hopeful outlook as compared with other weapons. This may seem a curious statement to make, but consider the following. We cannot envisage advances in the use of explosives in shell or bomb to render them more humane. Explosives, if their development be pressed, can only become more violent, with a wider range of action. Chemical warfare may follow the same lines, but it has the unique possibility of developing on more humane lines. The vesicant action of mustard gas produced huge casualties with relatively little permanent harm. Chemicals may be found which temporarily influence human functions, enabling military objectives to be attained with a remarkably small amount of pain and death. In a fair review of the whole situation, this possibility cannot be overlooked. It is more than possible that a League of Nations, compelled to employ an element of force in its eventual control of peace, may find its most effective and humane weapon in some chemical development. However visionary these views may appear, they are not unjustified as scientific possibilities. Analysis of war gas casualties reveal two main trends. As the struggle became more intense the number of casualties multiplied. They were considerable during the first period of cylinder attack, and the rate remained steady until the beginning of the mustard gas period. From the summer of 1917 to November, 1918, there were more than ten times as many gas casualties as for the preceding three years of war. But the percentage mortality, the number of deaths amongst each hundred men attained, decreased considerably. As high as twenty-five per cent. during the early cylinder attacks, it decreased to two and a half per cent. for the huge number of mustard gas cases. Yet mustard gas was an exceedingly important military factor. It illustrates the possibility of development on these lines, but we must by no means disregard the atrocity of chemical warfare, and safeguards are required for the future.
We cannot do better than conclude by quoting from General Hartley's report to the British Association. He says:
"The general impression that gas is an inhumane weapon is derived partly from the German breach of faith in using it contrary to the Hague Convention, and partly from the nature and number of casualties in the earliest cloud attacks which were made against unprotected troops. Under the stress of a long war the individual is apt to forget the physical and mental sufferings it involves, unless he is daily in contact with them, but a dramatic occurrence such as that of the first gas attack forces on the imagination the brutal significance of war—the struggle for victory by killing—and the new weapon is judged as inhumane, like gunpowder in the fifteenth century. If we accept war as a possibility, the most humane weapon is that which leads to a decision with the smallest amount of human suffering and death. Judged from this standpoint, gas compares favourably with other weapons during the period when both sides were fully equipped for offence and defence. The death-rate among gas casualties was much lower than that among casualties from other causes, and not only was the death-rate lower, but a much smaller proportion of the injured suffered any permanent disability. There is no comparison between the permanent damage caused by gas, and the suffering caused to those who were maimed and blinded by shell and rifle fire. It is now generally admitted that in the later stages of the war many military objects could be attained with less suffering by using gas than by any other means.