Without taking into account the limitless reserve of American aerial potentiality, it is clear that within a year the Allies will have at their disposal many thousands of war aeroplanes. A proper apportionment of such of them as can be spared for offensive purposes could secure illimitable results. If for no other cause it would shorten the war by its effect on civilian nerves. We remember the hysterical outburst of rage occasioned by the losses consequent upon a daylight raid on London of some fifteen machines, though the public had become inured to the million military casualties since 1914. What, then, would be the effect on German war-weariness if giant raids on fortified towns by a hundred or so allied machines were of weekly occurrence? And what would be the effect on our own public if giant raids on British towns were of weekly occurrence? Let us make the most of our aerial chances, and so forestall betrayal by war-weariness, civilian pacifism, self-centred fools, and strange people. From an army point of view the probable outcome of an extensive aerial offensive would be still greater. Well-organised bomb raids on German aerodromes during the night and early morning have several times kept the sky clear of hostile aircraft during the day of an important advance. If this be achieved with our present limited number of bombing machines, much more will be possible when we have double or treble the supply. Imagine the condition of a particular sector of the advanced lines of communication if it were bombed every day by scores of aeroplanes. Scarcely any movement would be possible until bad weather made the attacks non-continuous; and few supply depôts in the chosen area would afterwards remain serviceable. Infantry and artillery dependent upon this district of approach from the rear would thus be deprived of essential supplies. Apart from extensive bombing, an air offensive of at least equal value may happen in the form of machine-gun attacks from above. To-day nothing seems to panic the Boche more than a sudden swoop by a low-flying aeroplane, generous of bullets, as those of us who have tried this game have noticed. No German trench, no emplacement, no battery position, no line of transport is safe from the R.F.C. Vickers and Lewis guns; and retaliation is difficult because of the speed and erratic movement of the attacking aeroplane. Little imagination is necessary to realise the damage, moral and material, which could be inflicted on any selected part of the front if it were constantly scoured by a few dozen of such guerilla raiders. No movement could take place during the daytime, and nobody could remain in the open for longer than a few minutes.