Just in front of the wood where the battery was concealed, stood an old farmhouse where a genial Frenchwoman lived and dispensed good cheer to us. She had none of the men of her own family nor any farmhands to help her, but kept up the farmwork all alone. Every day, usually in the middle of the morning, she went out to the fields behind her house and ploughed, with an old white horse drawing the plough. For some reason she never ploughed more than one or two furrows at a time, and when this was done, she drove the white horse back to the barn. One day, an officer noticed that a German plane hovered over the field while the woman was ploughing, and that when she went back to the house, the plane shot away. The next day the same thing happened. Later in the day, the battery received its daily reminder from the Boche gunners, as unerringly accurate as ever. Here was a clue. The solution of the problem followed. The woman knew the position of the battery, and every day when she went out to plough, she drove the white horse up and down, making a furrow directly in front of the battery. When the men in the German plane saw the white horse, they flew overhead, took a photograph of the newly turned furrow, and turned the photograph over to their gunners. The rest was easy. [Illustration: A TANK GOING OVER A TRENCH ON ITS WAY INTO ACTION] The next day we missed three events which had become part of our daily life. The German plane no longer hovered in the air. Our battery, for the first time in weeks, spent a peaceful day. And in the field behind her house, a woman with an old white horse no longer made the earth ready for the sowing. * * * * * For three days now we had received no rations, and were obliged to subsist on the food which the Boche had left behind him when he fled. Finally, when all our plans were complete, we were notified that the point of attack had been shifted to N----, a village about four miles away. This practical joke we thought in extremely bad taste, but there was nothing for it but to pack up and move as quickly as possible. We learned that our troops at N---- had tried twice to break through the German lines by bombing. A third attempt was to be made, and the tanks were depended upon to open the way. Hence the change in our plans. Early the next morning we left O----, and dashed along a road which lay parallel with our line, and was under direct observation from the German trenches. Owing to the fact, probably, that he was not properly settled in his new line, the Boche did not bother us much, excepting at one place, where we were obliged to make a run for it. We arrived at N---- just after the tanks had been brought up. They were hurriedly concealed close up to houses, in cuttings, and under trees.