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§ 18 use of the aeroplane for reconnoitring is that it informs the enemy of the advance or presence of a hostile force. Where this fact is of weight, the protecting flight or squadron of aeroplanes would be best handled as a supporting force, with perhaps one machine at high altitude to maintain contact, the duties of this latter machine being to keep in touch and transmit information to the divisional or army corps command, and to call for the supporting aeroplane force should occasion require. Exactly how the combination of the two Arms (aircraft and cavalry) will be controlled and handled it is impossible, without actual experience, to lay down. The main point is that in the new Arm we have a force altogether transcending the cavalry in mobility and range of observation, and which before long will become an actual fighting force of no mean importance, and these facts cannot fail to be revolutionary in their ultimate influence on the rôle and employment of the cavalry Arm.