We cross a meadow and enter a trench. Here and there it comes to the surface again where there is dead ground. At one such point an old church stands, with an unexploded shell sticking out of the wall. A century hence folk will journey to see that shell. Then on again through an endless cutting. It is slippery clay below. I have no nails in my boots, an iron pot on my head, and the sun above me. I will remember that walk. Ten telephone wires run down the side. Here and there large thistles and other plants grow from the clay walls, so immobile have been our lines. Occasionally there are patches of untidiness. 'Shells,' says the officer laconically. There is a racket of guns before us and behind, especially behind, but danger seems remote with all these Bairnfather groups of cheerful Tommies at work around us. I pass one group of grimy, tattered boys. A glance at their shoulders shows me that they are of a public school battalion. 'I thought you fellows were all officers now,' I remarked. 'No, sir, we like it better so.' 'Well, it will be a great memory for you. We are all in your debt.' They salute, and we squeeze past them. They had the fresh, brown faces of boy cricketers. But their comrades were men of a different type, with hard, strong, rugged features, and the eyes of men who have seen strange sights. These are veterans, men of Mons, and their young pals of the public schools have something to live up to. * * * * * Up to this we have only had two clay walls to look at. But now our interminable and tropical walk is lightened by the sight of a British aeroplane sailing overhead. Numerous shrapnel bursts are all round it, but she floats on serenely, a thing of delicate beauty against the blue background. Now another passes--and yet another. All morning we saw them circling and swooping, and never a sign of a Boche. They tell me it is nearly always so--that we hold the air, and that the Boche intruder, save at early morning, is a rare bird. A visit to the line would reassure Mr. Pemberton-Billing. 'We have never met a British aeroplane which was not ready to fight,' said a captured German aviator the other day. There is a fine stern courtesy between the airmen on either side, each dropping notes into the other's aerodromes to tell the fate of missing officers. Had the whole war been fought by the Germans as their airmen have conducted it (I do not speak of course of the Zeppelin murderers), a peace would eventually have been more easily arranged. As it is, if every frontier could be settled, it would be a hard thing to stop until all that is associated with the words Cavell, Zeppelin, Wittenberg, Lusitania, and Louvain has been brought to the bar of the world's Justice.