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§ 106. The Fourth Arm in Peace Time. The problems connected with the maintenance of the Fourth Arm in time of peace are numerous, and present difficulties which will certainly be found to increase as the numerical strength of the Arm is augmented. It is not easy to form any real conception of what the future may have in store in the direction of numbers, but as a matter of guesswork it is difficult to believe that, sooner or later, the strength of the Flying Corps will not reach or exceed 1 per cent, of the number of bayonets. Thus a considerable part of the work formerly allotted to cavalry will in the future be assigned to the new Arm, and the cavalry ordinarily represents from 5 to 10 per cent, of the number of bayonets. Also, the guns will require the assistance of aircraft, probably one or more machines being attached to each battery or group. Beyond this there will be specialised fighting-machines of different denominations. Taking everything into consideration, the suggested 1 per cent, does not look like an overestimate; it is probably too low.

Assuming 1 per cent, as a basis, the numbers are already formidable. Thus, for the British regulars on home service prior to the outbreak of war, the number would need to be at least some 1,000 machines. In the case of the large Continental armies—say, the French—with over 700,000 men (peace footing), it may be