On clear days there is a good deal of aeroplane activity in our section, and one never tires of watching the planes. The German machines do not bomb us in this district, for some reason unknown to me, but they try to reconnoiter and observe for artillery fire. It is perfectly obvious, however, that the French have the mastery of the air, by virtue of their skillful and courageous pilots and superb fighting machines, and their superior skill in anti-aircraft fire. To watch a plane at an altitude of, say, nine thousand feet under shrapnel fire, one would think the pilot was playing with death; but in reality his occupation is not so tremendously risky. Consider these factors: he is a mile and a half to two miles from the battery shooting at him, he presents a tiny mark, and his speed is from eighty to one hundred and twenty-five miles per hour. Above all, he can twist and turn or change his altitude at will. The gunner must calculate his altitude and rate of speed, and after the lanyard is pulled, considerable time elapses before the shell reaches its mark. Meanwhile, the aviator has probably come down or risen or changed his course. It is like trying to shoot a twisting snipe with very slow-burning powder--the odds are all in favor of the snipe. All the same, the spectacle never quite loses its thrill. High and remote against the sky you see the big reconnaissance machine going steadily on its way, its motor sending a faint drone to your ears. Keeping it company, darting around it like a pilot-fish around a shark, is the tiny, formidable appareil de chasse, a mere dot against the blue. _Crack! Whang! Boom!_ goes a battery near by, and three white puffs spring out suddenly around the distant machines, above, behind, below. Another battery speaks out, another and another, till the sky is filled with downy balls of smoke. Suddenly the firing ceases, and the big German aero slants down swiftly toward its base. A sharper droning hits your ears. There, directly above us, a French fighting machine is rushing at two hundred kilometres an hour to give battle to the little Fokker. Close together, wheeling and looping the loop to the rattle of their mitrailleuses, they disappear into a cloud, and we can only guess the result. _One day later_ I finished the paragraph above just as a wave of rifle and machine-gun fire rolled along the lines. Running out of the abri to see what the excitement was about, I saw two French aeros skimming low over the German trenches--where every one with any kind of a fire-arm was blazing away at them. Fortunately, neither one was hit, and after a couple of retaliatory belts, they rose and flew off to the south. The Germans began to waste shrapnel on the air, and indiscreetly revealed the location of a battery, which the French promptly bombarded with heavy guns. Pretty soon all hands were at it--a two-hour Fourth of July.