We passed a church with a roof smashed by an aeroplane a few days before--and caught at the same time the first "B-r-r-rurm!" from the cannonading to the west--a supply-train, an overturned motor-van, and here and there packed ammunition wagons and guns. Presently, in the lee of a little brick farmhouse a short distance from the village of Aubers, we alighted, and, with warnings that it was better not to keep too close together, walked a little farther down the road. Not a man was in sight, nor a house, nor gun, not even a trench, yet we were, as a matter of fact, in the middle of a battle-field. From where we stood it was not more than a mile to the English trenches and only two miles to Neuve Chapelle; and even as we stood there, from behind us, from a battery we had passed without seeing, came a crash and then the long spinning roar of something milling down aisles of air, and a far-off detonation from the direction of Neuve Chapelle. Tssee-ee-rr... Bong! over our heads from the British lines came an answering wail, and in the field, a quarter of a mile beyond us, there was a geyser of earth, and slowly floating away a greenish-yellow cloud of smoke. From all over the horizon came the wail and crash of shells-- an "artillery duel," as the official reports call it, the sort of thing that goes on day after day. Somebody wanted to walk on to the desolate village which raised its smashed walls a few hundred yards down the road. The tall young officer said that this might not be done--it would draw the enemy's fire, and as if to accent this advice there was a sudden Bang! and the corner of one of the houses we were looking at collapsed in a cloud of dust. Under these wailing parabolas, swinging invisibly across from horizon to horizon, we withdrew behind the farmhouse for lunch--sandwiches, frankfurters kept hot in a fireless cooker, and red wine--when far overhead a double-decker English aeroplane suddenly sailed over us. It seemed to be about six thousand feet above us, so high that the sound of its motors was lost, and its speed seemed but a lazy, level drifting across the blue. Did it take those three motor-cars and those little dots for some reconnoitring division commander and his staff? Aeroplanes not only drop bombs, but signal to their friends; there was an uncomfortable amount of artillery scattered about the country, and we watched with peculiar interest the movements of this tiny hawk. But already other guns, as hidden as those that might be threatening us, had come, as it were, to the rescue. A little ball of black smoke suddenly puffed out behind that sailing bird, and presently a sharp crack of a bursting shrapnel shell came down to our ears. Another puff of smoke, closer, one in front, above, below. They chased round him like swallows. In all the drab hideousness of modern warfare there is nothing so airy, so piquant, so pretty as this.