Sometimes it is difficult to say who has command of the air at a certain section of the line. This big red plane, and a few others of its type, seemed to be speedier than any of ours on this front; but just as we have gradually surpassed the German in artillery, in the morale of our men, in control of No Man's Land, and in general offensive power, it was only a matter of a short time till we again took control of the air on this front, as we have on others. The control of the air depends in great part, not on the courage of the aviators, but on the efficiency of their machines. Two days later I saw this red plane, or one of its type, daringly fly over our lines, and only about 300 feet above them--an exceedingly low flight over enemy lines. A scouting plane of ours, much inferior in speed and fighting power, but manned by some brave boy who cared not for his life so long as he did his duty, flew straight at the red machine. We watched in strained silence, while they circled about each other, their machine-guns spitting fire, and once they nearly collided, head on. The Hun decided to retreat, and flew back over his own lines; and our man, or boy, sailed away in another direction to continue the observation work he had been doing when the Hun came. Had our boy lost, his would have been just another name added to the long list of heroes of the Royal Flying Corps; for his act, in risking his life in attacking a much speedier and more dangerous machine than his own, was the act of a noble, courageous, fearless boy, well worthy of all praise, and of the finest decoration. Had he succeeded in downing his enemy, luck would have been on his side, for success in fighting in the air, as in ordinary life, often depends on chance. Besides the courage displayed by the youthful members of the air service, they and their German enemy-rivals usually display toward each other a chivalry perhaps not equalled in any other branch of the army. It is partly due, no doubt, to the fact that the men who go into the air service, outside of their courage, are naturally lovers of the picturesque and spectacular. It is also due to the unconscious admiration one brave man has for another; the pity which he must feel for a fellowman whom he may shoot to his death ten thousand feet in the air; and finally, the knowledge that it is only a matter of time, if he remains in the service, till he meets a superior machine, if not a braver man, who may give him the same fate. This feeling does not prevent them fighting most fiercely, for each knows that while to the winner may come rewards and decorations, to the loser comes almost certain death. But if by chance they both escape through poor firing, exhaustion of ammunition, or that great element, chance, there is little or no personal hatred, but rather admiration for a brave foe.