Popular terror of gas—Necessity for drilling and early personal experience—Sure defence from gas possible—The first gas alarms—The prussic acid scare a myth—The phosgene scare a reality—The helmet made to combat it—Necessity for renovating the helmet.

The final object in the training of men in defence against gas is that troops shall be able to protect themselves completely and as quickly as possible in all the multitudinous circumstances in which they may encounter the poisonous gas in the field. To attain this it is necessary to inspire confidence by letting them in as far as possible on the principles underlying the use of gas and the tactics which are adopted by the enemy; and, secondly, to bring their practical proficiency and discipline up to such a standard that they make the very best use of the apparatus that is given to them.

It must be remembered that one of the greatest difficulties in talking to people about gas is the mystery of it. Even educated people hardly understand the word “gas” in connection with war and are apt to think of coal gas and dentists’ gas in consequence. The result is that the gas of the Germans was sometimes credited with all sorts of impossible qualities of movement and deadliness, and it can hardly be realised what alarm and distrust may exist in the raw recruit with regard to gas until he has been given some instruction. This is even as great a danger as the over-confidence of the veteran soldier, who may know just as little about it.

Mere drilling and assertion are not sufficient to inspire confidence and acquire proportion, and it was realised very early that personal experience was needed. To gain this arrangements were made for every man to see and smell gas in concentrations that would at any rate produce severe discomfort if dwelt in for any length of time, and for each soldier subsequently to be exposed to gas while wearing a gas helmet in such a concentration that negligence in obeying orders or in using the smoke helmet correctly would lead to real danger to life. By this means confidence could be inspired in everybody, though there is always a certain danger due to recklessness among the more adventurous types.

Besides this it was necessary to give as many men as possible some idea of the common sense of the operations in which the army was being drilled. This could only be done by giving a clear idea of how the gas is used; how gas travels; where it accumulates; how it can be removed, and so on; and under what conditions a respirator or smoke helmet protects or ceases to protect its wearer. It was on these lines that instruction was built up; and to do it thoroughly it was found that a large number of instructors were required in order to train the officers and noncommissioned officers and to get them to treat their respirators with as great respect as their rifles and to learn to carry them through a gas-defence drill in just as smart a manner as the ordinary arms.

For this purpose special schools of instruction were started at each army headquarters, and as many regimental officers and noncommissioned officers as possible were given a four or five days’ course of gas training, so that they in their turn could go back to their regiments and spread the gospel, as the responsibility for getting things done must eventually fall upon them. Not only was it found impossible to provide specialist officers for each regiment or battalion, but it was recognised that such a procedure would have a bad effect on the gas-defence measures.

Gas defence was a matter which affected everybody and was in no way to be regarded as a specialist’s job; battalions were already full of specialists. Indeed the colonels were apt to complain that they had nobody but specialists to command. There were bombers, snipers, signalers, machine gunners and sanitary men; and at that time the trench-mortar personnel was also a part of the infantry battalion. With all these things the feeling was that if a job could be looked on as being a specialty it should be put on the specialist officer concerned, and nobody else worried about it much. Now if gas defence was to become Lieutenant Snook’s job, it meant that it was going to be nobody else’s job, and it was essential that the idea should grow up in the army that gas defence was a purely military matter and affected everybody.

What was said then is just as true to-day—that the defensive appliance is a certain protection if it is used properly and in time. Defence against gas is thus on an entirely different footing from defence against shells and bullets, where protection cannot be assured; and, to quote instructions on the subject: “For destructive effects gas must depend on surprise, on poor discipline or on defective appliances. Consequently gas casualties are preventable if the soldier is trained continually to exercise vigilance and is well drilled in the use and care of his respirator.”

The basis of the whole thing, therefore, was that every officer should see that the men under his command were properly instructed in defensive measures against gas attacks, and that all orders on the subject were thoroughly understood. It was then up to the officers to see that their men could get their helmets on properly in the minimum time, and this involved considerable amount of drill practice. It was pointed out to the officers that since protection had been provided, those battalions which had been carefully instructed had come through practically unharmed, while those battalions in which instructions had been neglected suffered severely.

It was also up to the officers to explain to their men as much as they themselves had learned about gas clouds, and to impress on them, for example, that by moving to the rear they would move with the gas, and that if they got flurried they would breathe more deeply and would run much more risk of being gassed.