Guns mark the limit of the danger zone. Their screaming shells laugh at the sentries at the entrances to towns and at cross-roads who demand passes of all other travellers. Anyone who tried to keep out of range of the guns would never get anywhere near the front. It is all a matter of chance with long odds or short odds, according to the neighbourhood you are in. If shells come, they come without warning and without ceremony. Nobody is afraid of shells and everybody is--at least, I am. "Gawd! Wat a 'ole!" remarks Mr. Thomas Atkins casually, at sight of an excavation in the earth made by a thousand-pound projectile. It is only eighteen years since I saw, at the battle of Domoko in the Greco-Turkish war, half a dozen Turkish batteries swing out on the plain of Thessaly, limber up in the open, and discharge salvos with black powder, in the good, old battle-panorama style. One battery of modern field guns unseen would wipe out the lot in five minutes. Only ten years ago, at the battle of Liao-yang, as I watched a cloud of shrapnel smoke sending down steel showers over the little hill of Manjanyama, which sent up showers of earth from shells burst by impact on the ground, a Japanese military attaché remarked: "There you have a prophecy of what a European war will be like!" He was right. He knew his business as a military attaché. But the Allies might also make guns and go on making them till they have enough. The voices of the guns along the front seem never silent. In some direction they are always firing. When one night the reports from a certain quarter seemed rather heavy, I asked the reason the next day. "No, not very heavy. No attack," a division staff officer explained. "The Boches had been building a redoubt, and we turned on some h.e.s."--meaning high explosive shells. Night after night, under cover of darkness, the Germans had been labouring on that redoubt, thinking that they were unobserved. They had kept extremely quiet, too, slipping their spades into the earth softly and hammering a nail ever so lightly; and, of course, the redoubt was placed behind a screen of foliage which hid it from the view of the British trenches. Such is the hide-and-seek character of modern war. What the German builders did not know was that a British aeroplane had been watching them day by day, and that the spot was nicely registered on a British gunner's map. On this map it was a certain numbered point. Press a button, as it were, and you ring the bell with a shell at that point. And the gunners waited till the house of cards was up before knocking it to pieces.