This tactical activity is closely dependent upon the whole interior economy of the division. These few squadrons must furnish orderlies and despatch-riders, which, in the case of the conduct of so large a force as an infantry division, must mean a considerable drain on their strength. They will often be deputed to collect supplies in villages away from the roads, when the supply columns fail and the places occupied do not afford sufficient for the troops. Although it is possible that other troops, such as infantry in carts and bicyclists, may be used for this service, it will never be possible to relieve the divisional cavalry entirely of it. The relay service also makes a greater demand on the strength than is generally supposed. In the campaign of 1870-71 this cause contributed largely to the weakening of the squadrons at the front. Nowadays every effort is made by means of technical apparatus to relieve the cavalry, at least partially, from this service. It would, however, be a mistake to assume that the relay service of cavalry can be everywhere replaced by telegraph, telephone, signalling, bicycles, or motor. Circumstances will occur in war in which all these methods of transmission, which are already in themselves partially unreliable, must fail us, especially where they are exposed to destruction from the hand of the enemy. The proper performance of these interior services must never, however, miscarry throughout the whole campaign, and imposes therefore still higher and more continuous demands on the efficiency of the troops. As the result of these reflections we may conclude that a series of very important duties will fall to the lot of the divisional cavalry in war, which cannot be carried out by any other troops or in any other manner than by the divisional cavalry. Further, that these duties have, on the whole, increased in importance, and that their fulfilment has become considerably more difficult by reason of the conditions of modern war. According to these conditions the importance of the divisional cavalry must be judged. If the decisive rôle in war falls essentially to the lot of the army cavalry, yet must the duties of the divisional cavalry be regarded as just as necessary for the good of the army. Methods of training must be adopted with these points in view, and it must be quite clearly understood that in this direction modern conditions have to be reckoned with which demand thorough innovations.