Thus it can be seen that there will be practically constant use for war aeroplanes during a campaign—apart from their potentialities as weapons of destruction, concerning which notes will be written later. So highly does he rate the work of aircraft in wartime, for reconnoitring purposes, that the director of the military aviation service of the French army has declared: "Aeroplanes, carrying a steersman, observer, and combatant, will eventually supersede cavalry for scouting purposes." In this regard, it is interesting to note the opinion of a famous German military expert, who says:— "They (aeroplanes) will collect much information which would never be accessible to cavalry, and, above all, they will do it over long distances, and in a much shorter time. It is a defect of cavalry reconnaissance that the knowledge which it yields has necessarily, in the great majority of eases, been long overtaken by events. No small gifts, on the part of the General, are necessary to infer, from what was ascertained many hours previously, what is actually the existing situation. The possibilities of error are very great." Here is another striking tribute to the value of the war aeroplane. What this German expert was particularly impressed by, after observing a series of tests of aeroplanes for reconnoitring, was their wonderful speed, as compared with any other means of obtaining information. The point he makes, in this connection, is highly important. Not only will the aeroplane scout bring back news which it would be impossible to obtain by the use of cavalry, but he will place this news in the hands of a Commander-in-Chief while it is fresh, and of the fullest importance, and not many hours old—as the intelligence brought in by other methods of reconnaissance generally is. Another extremely useful function of the aeroplane, during a campaign, must not be forgotten. This is its use as a dispatch-carrier. In this regard, a light, swift machine will be found of utility. No ordinary obstacle will hamper it. The fact that the country is mountainous, or that there are awkward rivers to negotiate, present serious problems for the dispatch-rider, who sets out to carry a communication from point to point on horseback. In many cases, indeed, it becomes impossible to send a dispatch across country. But the aeroplane dispatch-carrier will think nothing of such difficulties as these. Over precipitous country, and across mountains, he will fly without hindrance; and he will be faced with no problems concerning the fording of rivers. As straight as an arrow, from point to point, he will carry his message, and at a pace in excess of that of the express train. The fact that skirmishing parties of the enemy are dotted about, between his starting-point and his objective, will not perplex him either, although it would prove a serious embarrassment to the dispatch-rider who used the land when in transit.