Already we had noticed many shells bursting five or six hundred yards away, in the direction of the new British trench; but at that distance they do not count. Then a railroad train seemed to have jumped the track and started to fly. Fortunately and unfortunately, sound travels faster than big shells of low velocity; fortunately, because it gives you time to be undignified in taking cover; unfortunately, because it gives you a fraction of a second to reflect whether or not that shell has your name and your number on Dug-out Street. I was certain that it was a big shell, of the kind that will blow a dug-out to pieces. Anyone who had never heard a shell before would have "scrooched," as the small boys say, as instinctively as you draw back when the through express tears past the station. It is the kind of scream that makes you want to roll yourself into a package about the size of a pea, while you feel as tall and large as a cathedral, judging by the sensation that travels down your backbone. Once I was being hoisted up a cliff in a basket, when the rope on the creaking windlass above slipped a few inches. Well, it is like that, or like taking a false step on the edge of a precipice. Is the clock about to strike twelve or not? Not this time! The burst was thirty yards away, along the path we had just traversed, and the sound was like the burst of a shell and like nothing else in the world, just as the swirling, boring, growing scream of a shell is like no other scream in the world. A gigantic hammer-head sweeps through the air and breaks a steel drum-head. If we had come along half a minute later we should have had a better view, and perhaps now we should have been on a bed in a hospital worrying how we were going to pay the rent, or in the place where, hopefully, we shall have no worries at all. Between walls of earth the report was deadened to our ears in the same way as a revolver report in an adjoining room; and not much earth had gone down the backs of our necks from the concussion. Looking over the parapet, we saw a cloud of thick, black smoke; and we heard the outcry of a man who had been hit. That was all. The shell might have struck nearer without our having seen or heard any more. Shut in by the gallery walls, one knows as little of what happens in an adjoining cave as a clam buried in the sand knows of what is happening to a neighbour clam. A young soldier came half- stumbling into the nearest dug-out. He was shaking his head and batting his ears as if he had sand in them. Evidently he was returning to his home cave from a call on a neighbour which had brought him close to the burst. "That must have been about six or seven-inch," I said to the officer, trying to be moderate and casual in my estimate, which is the correct form on such occasions. My actual impression was forty-inch. "Nine-inch, h.e.," replied the expert.