Our futile efforts were interrupted by the sound of feet upon the causeway as a column of reliefs loomed up out of the darkness. A hurried altercation in low tones, a subdued word of command, and a dozen men, their rifles and entrenching tools slung over their shoulders, applied themselves to the back of our car, and slowly it slithered out of the mud. The column broke into file to allow us to pass, my companion went on ahead with a tiny electric torch to show the way, and with infinite caution we nudged slowly along the rank, the faint light of the torch bringing face after face out of the darkness into _chiaroscuro_, faces young and fresh and ruddy. Not a word was spoken save a whispered command carried down the rank, mouth to ear, "No smoking, no talking "--"No smoking, no talking "--"No talking, no smoking." Mules, carrying sections of machine-guns and packs of straw, loomed up out of the darkness as we passed, until the last of the column was reached and the frieze of ghostly figures was swallowed up into the night. We drew a long breath, for we knew now from the colonel of the battalion whose men had delivered us from that Slough of Despond that we had been within 150 yards of the German lines. We had mistaken Richebourg l'Avoue for Richebourg St. Vaast. VIII IDOLS OF THE CAVE Like the Cyclopes they dwelt in hollow caves, and each Colonel uttered the law to his children and recked not of the others except when the Brigadier came round. True there were two and a half battalions in their line of 2700 yards, but all they knew was that the next battalion to their own was the Highlanders; it was only when the five days were up and they were marched back to billets that they were able to cultivate that somewhat exclusive society. Their trenches were like the suburbs, they were faintly conscious that people lived in the next street, but they never saw them. Their neighbours were as self-contained and silent as themselves, except when their look-outs or machine-guns became loquacious. Then they too became eloquent, and the whole line talked freely at the Germans 200 yards away. By day the men slept heavily on straw in hollows under the parapet, supported with crates and sprinkled with chloride of lime; by night they were out at the listening posts, in the sap-heads, or behind the parapet, with their eyes glued to the field of yellow mustard in front of us. They had watched that field for three months. They knew every blade of grass therein. No experimental agriculturist ever studied his lucerne and sainfoin as they have studied the grasses of that field. They have watched it from winter to spring; they have seen the lesser celandine give way to pink clover and sorrel, and the grass shoot up from an inch to a foot. They have, indeed, been studying not botany but ethnology, searching for traces of that species of primitive man known to anthropologists as the Hun. They have never