All three observers did their work, making brief notes, and rough maps, as they flew over the fortifications. One of them, using a special camera with a telephoto lens, secured a series of photographs from a height of 4000 feet. But the point of the test was this: when the three observers had returned safely to their starting-point, their reports and maps were compared with the exact details of the fortifications, which were in the hands of the Commander of the air-corps. The result was instructive. Without any previous knowledge of the changes which had been made in the fortifications reconnoitred, the three observers had been able to indicate, with clearness, the position of all the defences. From their material, indeed, it was found possible to prepare a map which corresponded with that previously provided by the officer in charge of the fortifications. The test was considered a very effective one. It showed that an aerial observer could—even when at a considerable altitude—carry out a reconnaissance with accuracy, and prepare maps which could compare favourably with those drawn up at leisure, and as a result of detailed survey work carried out on the spot. As regards the reconnoitring flights carried out by the officer-airmen during the manœuvres, there is not a great deal to be said, for the reason that they were uniformly successful. The Commanders-in-Chief stated what they required, and the airmen carried out their orders. With the information thus provided for them, both Commanders-in-Chief found it necessary, more than once, to alter their plans. Not one day, but practically every day, the airmen were able to carry out their appointed tasks, and their work of reconnaissance became an adjunct which could be definitely relied upon. II. Work in the German manœuvres—An instance of the utility of air-scouts—Reconnoitring from high altitudes. In the German autumn manœuvres, 1911, the aeroplane may be said to have made its first practical appearance in connection with military operations in this country; and, here again, complete success marked the tests. One instance, regarding these German manœuvres, is forthcoming of the manner in which vitally-important information may be obtained by reconnoitring airmen. The Commander of the Red forces, suspecting some definite move on the part of his enemy on a certain morning, sent out several aerial observers. They performed a successful flight, and returned quickly with the information that a large body of the Blue troops was beginning to advance against the Red right. Taking instant action, upon the receipt of this intelligence, the Red Commander pushed forward a very large body of men to a point of strategic importance, and so was able to checkmate, very neatly, the advance of the Blue troops.