Toward the end of the week, plans for another attack were arranged. This time it was to take place at C----, about five miles north of N----. We were told that this was to be a "big show" at last. Part of the Hindenburg Line had been taken, and part was still in the hands of the enemy. It had been decided, therefore, that this sector of the line, and the village behind it, must be captured. Our share in the business consisted of a few tanks to work with the infantry. Two of us went up three days before to arrange the plans with the Divisional Commander. We wandered up into the Hindenburg Line as close as we could get to the Boche, to see what the ground was like, and to decide if possible on the routes for the tanks. In the line were innumerable souvenirs. We found the furniture that the Germans had taken out of the villages on their retirement, and had used to make their line more comfortable. We found, too, an extraordinary piece of engineering. A tunnel about ten miles long ran underneath the whole of the Hindenburg Line. It was about thirty or forty feet down, and had been dug, we heard, by Russian prisoners. The tunnel was about six feet wide and about five feet high. It had been roughly balked in with timber, and at every twenty yards, a shaft led out of the tunnel up into the trench. Borwick found a large mirror which he felt could not be wasted under the circumstances. He could not resist its charm, so he started lugging it back the six miles to camp. It was very heavy and its charm had decreased greatly by the time he reached camp and found that no one could make any use of it. The day of the attack was still undecided, and in order to be quite ready when it should come off, we left B---- with the tanks one evening and took them up to Saint-L----, a little place about three thousand yards away from the Hindenburg Line. Here we staged them behind a railway embankment, underneath a bridge that had been partially blown up. This was the same embankment, as a matter of fact, behind which, four or five miles away, the Australian dressing-station had been established in the last battle. Here we spent two or three days tuning up the machines, and many of our leisure moments in watching a howitzer battery which was just beside us. This was fascinating. If you stand by the gun when it is fired, you can see the shell leave the muzzle, and watch the black mass shoot its seven or eight thousand yards until it becomes a small speck and finally vanishes just before it hits the ground.