Our trenches were not satisfactory, as we did not know accurately where those of the Germans were. That night, instead of going back to the 1st Brigade I made my way to the huge Rouville Caves under Arras, where the whole of the 3rd Brigade were quartered. It was a most curious abode. No one knows when the caves were dug. They were probably extended from time to time as the chalk was quarried for the purpose of building the town. Long passages stretched in different directions, and from them opened out huge vaulted chambers where the battalions were billeted. I spent the night with the 14th Battalion, and the next day held services in turn for each of the four units of the Brigade. The 16th Battalion occupied a huge cavern with others branching off from it. I could hardly imagine more picturesque surroundings for a military service. The candle flames twinkled like stars in all directions in the murky atmosphere, and the singing of the men resounded through the cave. Overhead was the town which the enemy was shelling. In one of the caves we found the foundation of what had been an old prison, with a date upon it of the 18th century. It was very pleasant wandering down the passages, with a candle (p. 247) stuck on the top of my steel helmet, and meeting everywhere old friends who were glad of the temporary rest. Life there, however, was very strange. One could not tell whether outside it was day or night. I made my way back that afternoon by a passage which led out to one of the Arras sewers, by the side of which there was a stone pavement enabling one with a good flashlight to walk safely. The exit from the sewer, which now consisted of a shallow stream of perfectly clear water, led me up to a house in one of the streets, and thence by a car I made my way to Warlus, and home to Fosseaux.