Writers have served us trenches in every possible literary style that censorship will permit. Whoever “tours” one is convinced that none of the descriptions published heretofore has been adequate and writes one of his own which will be final. All agree that it is not like what they thought it was. But, despite all the descriptions, the public still fails to visualise a trench. You do not see a trench with your eyes so much as with your mind and imagination. That long line where all the powers of destruction within man’s command are in deadlock has become a symbol for something which cannot be expressed by words. No one has yet really described a shell-burst, or a flash of lightning, or Niagara Falls; and no one will ever describe a trench. He cannot put any one else there. He can only be there himself. The first time that I looked over a British parapet was in the edge of a wood. Board walks ran across the spongy earth here and there; the doors of little shanties with earth roofs opened on to those streets, which were called Piccadilly and the Strand. I was reminded of a pleasant prospector’s camp in Alaska. Only everybody was in uniform and occasionally something whished through the branches of the trees. One looked up to see what it was and where it was going, this stray bullet, without being any wiser. We passed along one of the walks until we came to a wall of sandbags-- simply white bags about three-quarters of the size of an ordinary pillowslip, filled with earth and laid one on top of another like bags of grain. You stood beside a man who had a rifle laid across the top of the pile. Of course, you did not wear a white hat or wave a handkerchief. One does not do that when he plays hide-and-seek. Or, if you preferred, you might look into a chip of glass, with your head wholly screened by the wall of sandbags, which got a reflection from another chip of glass above the parapet. This is the trench periscope; the principle of all of them is the same. They have no more variety than the fashions in knives, forks and spoons on the dinner table. One hundred and fifty yards away across a dead field was another wall of sandbags. The distance is important. It is always stated in all descriptions. One hundred and fifty yards is not much. Only when you get within forty or fifty yards have you something to brag about. Yet three hundred yards may be more dangerous than fifteen, if an artillery “hate” is on.