And this is a most important point: so swift and unexpected was the night attack that the machines only came into view just at the moment they were releasing their bombs. This would probably have meant that, in warfare, they would have escaped without an effective shot being fired at them. By such tests as these, regarding which, as a general rule, nothing becomes public, the German military authorities are obtaining data that is invaluable concerning the destructive potentialities of the war aeroplane. Apart from the actual damage done by such a night attack as has been described, there is its moral effect to be considered—and this point is regarded as an important one by foreign experts. Nothing, they think, could be more harassing or wearying for troops, during a hard campaign, than to be attacked, night after night, by squadrons of aeroplanes. Incessant watchfulness, and consequent loss of rest, would be involved, and a general feeling of uneasiness would be occasioned. It is now considered feasible to carry a light machine-gun upon an aeroplane, and to use it effectively. With such guns, skilfully handled, it is considered that attacks could be delivered upon reserve troops, upon artillery trains, upon the horses of guns in action, and upon troops when on the march. Considerable experience, in handling a machine-gun on an aeroplane will, probably, be necessary before accuracy can be obtained; but military men, who are most competent to speak, see no difficulty in equipping an aeroplane with such a gun, and in obtaining satisfactory results. In conclusion, it may be taken that the offensive possibilities of the aeroplane grow, from day to day. Machines are built to fly faster, and to carry heavier weights. In future, so far as the question of this destructive work of machines is concerned, it will be necessary to reckon air-fleets not in hundreds, but in thousands. At the moment, as has been said, the reconnoitring machine is engaging most attention; but an aeroplane for destructive use is being kept well in mind, none the less. Its appearance, as a weapon of war, is merely a matter of time. What may be accomplished, by a fleet of aeroplanes bent upon destruction, has only been hinted at in this section; but it should serve its purpose—which is to show that no country can afford to ignore what the future promises in this respect. FOURTEENTH SECTION WAR IN THE AIR BETWEEN HOSTILE AEROPLANES I. Certainty of a combat between aeroplanes in actual warfare—Air-scouts protected by aerial "cruisers." "The duty of an aerial fleet, armed and equipped for offensive warfare, will be to put out of action an enemy’s aerial force before it can carry out its role of reconnoitring—or attacking vital points of communication." In these words, a military authority of international repute indicates the war in the air which will, inevitably, take place in connection with any future European campaign.