The Commander-in-Chief who has no proper air-corps, in the next great war, will be in a hopeless position. He will have lost a battle practically before it begins. Whereas his opponent will know exactly what _he_ is doing, he will be able to obtain nothing but vague and confusing tidings as to the movements of the enemy. Imagine two armed men approaching each other, one being blindfolded. The Commander-in-Chief without aeroplanes will be like a blindfolded man. One nation stands head-and-shoulders above all others in the matter of her aerial equipment and experience. That nation is France. So far ahead is she that it will be a long time before other countries will be able to come up with her; but Germany is now making desperate efforts to do so. Until recently, it must be said, England lagged inactively not only behind France and Germany, in the organising of an air-corps, but even behind such countries as Austria, Italy, and Spain. Now, however, there are promises of a change. For this, mainly, we must thank the energy and enthusiasm of Colonel Seely, Parliamentary Under Secretary of State for War. When these lines are being read, British aeroplane manufacturers will be preparing for an important military trial of aeroplanes, which is to be held in England during the summer. The War Office has begun to buy aeroplanes, although on a small scale. We now have a Royal Flying Corps; a body of skilled airmen is being trained. But money is spent very sparingly. Our equipment, compared with that of France, is still a negligible quantity. In machines, and men, and, above all, in training, we are very far behind. Only by persistent and intelligently directed work, by the spending of more money, by the practical encouragement of manufacturers, and by the appointing of executive officers who are experts in their field of work, can we hope even to approach the organisation of the air-corps of France. But a beginning has certainly been made. By the end of the forthcoming flying season, we should have in England a small, but well-equipped air service. And the work of this corps will be its own advertisement. Once the potentialities of the war aeroplane are realised adequately, a stinting policy will be impossible. It is our aim, in this book, to show what the war aeroplane has done, and can do. At present, its work has been confined to scouting. But it has other, and grimmer possibilities. It can, and without doubt will, be used as an engine of destruction—not by means of the bomb-dropping attacks of a few aeroplanes, but by the organised onslaught of large squadrons of weight-lifting machines, which will be able to rain down tons of missiles over any given spot. And there is another possibility, also. Machines are carrying heavier loads every day. Soon the practicability of aeroplanes to transport troops—particularly in regard to hurrying up reinforcements in an emergency—will be demonstrated.