Chapter Seven.
Communications.
Such reports as the German agents at fixed posts have to make to their employers are communicated, whenever possible, by means of the travelling inspectors, for the postal service is not to be trusted where espionage is concerned. During the French Revolution there was originated what was known as the “Cabinet Noir,” or secret service of the post office in France, of which the duties were to intercept, open, and where desirable destroy or replace, such letters as were deemed unfit to reach their senders, in the best interests of the State. Berlin, with its genius for developing other people’s inventions, adopted this idea, and made of it one of the regular weapons of the secret service. It operates not only internally, but also internationally, and any suspected letters are freely opened and read; sometimes they are suppressed altogether from their recipients; sometimes false letters, giving contrary instructions, are substituted, and suspected spies of other Powers are caught by this means.
The idea has been generally adopted by most countries; but, in practically any country but Germany, the idea of personal and national honour is sufficiently strong to keep absolutely secret the doings behind official doors. For instance, at the trial of the spy Ernst at Bow Street, it came as a surprise to many people to learn that the British postal authorities possessed powers under which they might open any suspected missives, with a view to ascertaining their contents when deemed essential for the safety and well-being of the State. It is common knowledge in Germany that no letter is safe from being opened, and the powers which the British post offices exercise only in case of genuine suspicion are utilised in Germany to a far greater extent. Further, the officials at the Berlin post office “Cabinet Noir” do not always maintain the absolute secrecy that their work demands, and sometimes there creep out details of other things as well as espionage. Apparently, every German official has his price in his own country, and the habit of spying is so ingrained in the race that commercial secrets are bought and sold not only in the interests of German firms as a whole, but in the interests of one rival German firm which desires to steal a market from another firm of Teutonic name and standing. It appears that Stieber, by organising his colossal system of espionage, laid the foundations of national pettiness and deceit—the German character as a whole has been undermined by the knowledge that nobody is safe from espionage, and all acts are liable to be reported, while blackmail is a flourishing industry.
In the event of active service, the German system of communication between spies and the army in the field is very largely on the lines laid down by Klembovski, whose “Military Espionage in Peace and War” is one of the recognised textbooks on espionage. So clearly and well does Klembovski indicate the methods to be followed, that certain passages of his work with regard to this matter of communications are worthy of reproduction as they stand in his original work, in order to assist in a conception of the means employed.
It is not always possible, he says, for the spies to report personally to their chief about the results of their investigations; therefore it is of interest to consider the methods of communication by means of which they can forward the required information to the stipulated place. These methods of communication are to be grouped in three divisions, according to their nature: 1. Optical signals; 2. Agreed communications by writing; 3. Despatches in cipher.
1. Optical signals.—In operations in heavily wooded districts which obstruct reconnoitring by cavalry, or in the operations of detachments which consist only of infantry, the assurance of guarding against danger which is obtained by means of the despatch of patrols in the direction of the enemy embraces no especially broad stretch in the front of the troops. In such cases the duty of reconnaissance can be allotted to spies, who should collect the simplest and fullest possible information about the enemy. For example: presence or absence of the enemy in certain directions and at certain distances; the approximate strength of his troops; whether the enemy is on the march, at rest, or occupying a position. Such information is especially of importance to such detachments as possess cavalry, for the commander of the detachment can, if he has fresh knowledge of the presence and dispositions of the enemy, execute cavalry reconnaissances far better than he could without the knowledge to be obtained by spies. He can estimate the number and strength of the patrols which he intends to send out, and can give them the correct direction of marching to achieve their purpose, etc.
For communicating such information the simplest signals are desirable. Signals should be employed which on the one hand will not arouse the suspicions of the enemy, and on the other hand will not require special instructions and explanations, and will not occupy too much time either in preparation or sending.
If the country to the front of the troops offers a wide view, a spy sent on in advance can make fires, whose number and arrangement has a previously agreed meaning. Among the enemy’s outposts the making of fires will seldom be practicable, since it would at once arouse suspicion. In these cases the spy can make use of houses which can be seen from a distance on all sides, since the appearance and disappearance of a light in the windows, or the opening and shutting of the shutters, can have a recognised sense and meaning for the troops from whom the spy is sent.
Optical communication of news is seldom possible in wooded country, or at any rate only if the troops advance, and not if they retreat or remain stationary. In these cases the spy sent in advance can inform the troops by various agreed signs, such as breaking or tying together small trees and branches, moving turf, writing agreed-on signs with chalk on bark of trees, fences, houses, and big stones or rocks. Smugglers in some Russian districts use little stones, which they put down by the way on single big stones, heaps of earth, and leaves; as the number and position of the stones with regard to one another varies, so the smugglers mutually impart valuable information to each other. This method should be borne in mind for adoption by an army in the field.
2. Agreed communications by writing.—In many cases secret communication by writing can be carried on in the guise of quite ordinary correspondence, in which the speech is of trade and family matters, etc, so that a stranger, who was not initiated into the secret meanings of the special words, would attribute no special meaning to them. Such letters would be addressed to persons who are prominent through their business in official positions—lesser state officials and merchants, for instance.
In July 1887, at the Imperial Court of Justice at Leipzig, the trial took place of the Alsatians—Klein and Greber for espionage. In the indictment of the public prosecutor it was said, among other things, that the defendant Klein had never been directly in correspondence with the Bureau at whose head was Colonel Vincent, but he knew that his despatches had been communicated to the War Office from which Colonel Vincent took his orders. In order to arouse no suspicion, the correspondence was given the appearance of letters which passed between relatives; herein lay the reason for the constant repetition of Christian names, and the good wishes for Uncle, Aunt, and other persons who certainly did not exist, or under whose names personalities would be understood that were very well-known to the French secret service.
Usually the sender of such correspondence agrees with the recipient as to the way in which the communications shall be read. For example, in 1650 Prince Condé, who lay in prison on account of participation in the plot against the Guises and Catherine de Medici, received a letter which, perused in the ordinary way, could arouse no suspicion. But, in reading it, Condé missed out every other line, obtaining by this means a perfect meaning to fit the situation in which he was placed.
There is also a mechanical method of conducting a secret correspondence, for the deciphering of which both sender and recipient must have “castings,” or small metal plates exactly similar, which are divided by lines into squares. Some of the squares are cut out, the two plates being kept exactly similar and then the sender lays the square plate on the paper and writes his message in his usual writing on the cut-out squares; then he takes the plate from the paper and fills in the empty squares with casually chosen words, taking care, however, that some meaning is made from the double writing, so as to replace the real meaning when the plate is applied. On receipt of the letter the addressee lays his square on it, and comfortably reads everything that interests him, since the superfluous words which the sender wrote later are covered by the squares in the plate which have been left by the cutting-out.
All complex codes and similar means of communication occupy much time, so they are not for spies to use in time of war, though one can employ them in peace time. Certain solutions can be employed as inks, so that, when dry, they leave no trace on the paper; then one has only to warm the paper over a lamp, and the writing stands out clearly. This method, however, has been very largely used, and a blank sheet of paper is always an object of suspicion. And, in view of the meaning which an apparently simple letter may bear to eyes that can decipher the hidden meaning, it should be a rule in war to destroy all captured correspondence of the enemy. This rule should also be observed on the arrest of any suspected person.
3. Cipher correspondence.—There are a great number of systems of cipher-writing; one of the simplest is described in the following letter of Marshal Soult to General Neil, dated September 26, 1806, in which Soult writes: “His Majesty advises me to agree upon a cipher with you, which you will have to use in future in your correspondence with the Chief of Staff of the Army. In the execution of this you can, in my opinion, best make use of a pamphlet (of which the title is given in the letter). The first figure will give the number of the page; the second figure the line, reckoned from above, not counting the heading. The third number will serve as indication of the required word or letter, and give its position in the line indicated by the second figure: if the figure means a whole word, you will underline it; if it only means a letter, you will not do so. Commas must be put between the indicating figures.”
The disadvantages of this system consisted in the slowness of construction and deciphering of the message, since it would almost always be necessary to indicate not whole words, but each letter separately, for which three figures are necessary each time. To avoid the latter disadvantage a dictionary can be employed for the execution of the cipher, whereby in most cases one could succeed in giving the whole word with two figures.
A certain officer proposed to set up for this purpose a special military dictionary, similar to the marine signal-books existing in all countries. In this dictionary one could enter in alphabetical order all figures, letters, constantly occurring syllables, and complete military expressions. The officer in question was of the opinion that 3,000 ciphers would be quite enough to form a complete code. Thus all figures, letters, words, etc, would be numbered in the book in succession from beginning to end. In the preparation of reports one could then indicate by one cipher a figure, a letter, a syllable, and sometimes a whole word or even a whole phrase.
The disadvantage of such a system consists in that its foundation is always the same, and that the printed dictionary could easily be secretly obtained from all neighbouring States. In order to obviate this, a few alterations were subsequently proposed. One alteration was to the effect that one could take a given number to serve as a key; in preparing reports the key-number would always be added to the number under which is designated the required word in the dictionary. It may be assumed that the word “regiment” is required to be coded, and this word is number 500 in the dictionary; the key-number is 25; so in the report the word is indicated by 525. It is of course obvious that one could subtract, instead of adding, the key-number.
Another alternative consists in having two different key-numbers. In the report the words are indicated by figures always changing, first in the case of the one, and then of the other key-number. In this way one and the same word, indicated twice in the report, may each time be indicated differently. For instance, the word “division” is number 765 in the word-book; the key-numbers are 5,000 and 6,125. The first time the word “division” is indicated by the number 4,235 (that is, 5,000—765) and the second time by 5,360 (that is, 6,125—765).
The main disadvantage of all these various means of communication lies in that a book is essential, from which the deciphering will have to be done. The book in question is easily lost, or is not at hand at the required moment, and then the cipher is not only useless, but the work caused in obtaining the message is wasted.
An instance of this occurred in 1870, when one of the German generals received a message which he could not decipher at once, since the dictionary which the headquarter staff had arranged with him as a code-book was in a wagon which had been left behind. The same misfortune befell the commander of a French territorial division at Châlons-sur-Marne, who could not decipher a telegram, since by an oversight he had sent his cipher with the archives to Château Thierry.
For the ciphering of messages by spies the above systems are also disadvantageous because most spies can carry no books with them on their missions.
Thus writes Klembovski, who made a study of espionage on active service, but was unable to arrive at any method of transmitting messages which should be free of marked disadvantages. As to his contentions regarding the use of ciphers, it has been stated—though on what authority is hard to ascertain—that the German secret service will decipher any message in any language in a given space of time, no matter what code may be used. In one of Edgar Allan Poe’s stories there is a means shown of deciphering practically any code in which the characters are constant—that is, in which the same sign represents the same letter each time it is used—and it is quite probable that one used to the deciphering of code-messages could work out any code. For a code must be built up on some system, and therefore some reversal of the system must exist by means of which the message can be deciphered without the aid of a key.
Berlin recognises the uses of pseudo-clergy in time of war, for quite a number of German village clergy are impecunious and of a distinctly low class, and thus the army is not averse to their imposture. Men of this kind are selected for service in the field, where it is anticipated they can make themselves useful, under the pretext of ministering to the wounded, by extracting information about the movements of troops, etc. It is arranged that, in the event of a retreat, the clerical spy shall convey to the pursuing force detailed information regarding the losses in men and guns of those retreating, the numbers of men still unwounded, and the moral of the troops, by means of signals as detailed above—broken branches of trees, specially placed stones, and other things.
One favourite system of espionage on active service, from the German point of view, consists in the use of the Red Cross van. Under the rules governing international war, the Red Cross van may go anywhere, even into the enemy’s lines, to pick up wounded, and the German forces, “making war by all the violent means at their command,” have not scrupled to make use of Red Cross vans both for espionage work and as shelter for machine-guns—authentic cases are reported in which treacherous fire has been opened on the troops of the Allies in this way. Another method of obtaining information consists in sending two scouts out with a coil of wire, when in the presence of the enemy. The scouts, bearing one end of the wire, are instructed to approach the enemy’s lines, at night, and of course, when they have approached within sight, they are shot. The wire no longer “pays out” from the end kept in the lines, and the length unrolled, when hauled back and measured, gives the artillery-range almost to a nicety.
Communications in times of peace are never made direct to headquarters. The fixed spies, as already remarked, employ such agents as they may choose and their rate of pay allows. Their reports are collected by the travelling spies, who are under the control of agents of sections, stationed in Belgium and Switzerland (up to the outbreak of war) but not in Germany. From the agents of sections reports go to the Central Bureau of the secret service at Berlin, where sorting and classification of news supplied is pursued, and all that part of the world which could possibly be inimical to Germany is card-indexed. It is a sordid, sorry, mean business, utterly devoid of the romance and glamour with which the spy of fiction has invested it, and, whatever the fate of German armies in the field may be, the secret service of Germany has done more than anything else to pervert the moral sense of the nation.