We turned north after crossing the lines. Mulhouse seemed just below us, and I noted with a keen sense of satisfaction our invasion of real German territory. The Rhine, too, looked delightfully accessible. As we continued northward I distinguished the twin lakes of Gérardmer sparkling in their emerald setting. Where the lines crossed the Hartmannsweilerkopf there were little spurts of brown smoke as shells burst in the trenches. One could scarcely pick out the old city of Thann from among the numerous neighbouring villages, so tiny it seemed in the valley's mouth. I had never been higher than 7,000 feet and was unaccustomed to reading country from a great altitude. It was also bitterly cold, and even in my fur-lined combination I was shivering. I noticed, too, that I had to take long, deep breaths in the rarefied atmosphere. Looking downward at a certain angle, I saw what at first I took to be a round, shimmering pool of water. It was simply the effect of the sunlight on the congealing mist. We had been keeping an eye out for German machines since leaving our lines, but none had shown up. It wasn't surprising, for we were too many. Only four days later, however, Rockwell brought down the escadrille's first plane in his initial aërial combat. He was flying alone when, over Thann, he came upon a German on reconnaissance. He dived and the German turned toward his own lines, opening fire from a long distance. Rockwell kept straight after him. Then, closing to within thirty yards, he pressed on the release of his machine gun, and saw the enemy gunner fall backward and the pilot crumple up sideways in his seat. The plane flopped downward and crashed to earth just behind the German trenches. Swooping close to the ground Rockwell saw its débris burning away brightly. He had turned the trick with but four shots and only one German bullet had struck his Nieuport. An observation post telephoned the news before Rockwell's return, and he got a great welcome. All Luxeuil smiled upon him--particularly the girls. But he couldn't stay to enjoy his popularity. The escadrille was ordered to the sector of Verdun. While in a way we were sorry to leave Luxeuil, we naturally didn't regret the chance to take part in the aërial activity of the world's greatest battle. The night before our departure some German aircraft destroyed four of our tractors and killed six men with bombs, but even that caused little excitement compared with going to Verdun. We would get square with the Boches over Verdun, we thought--it is impossible to chase airplanes at night, so the raiders made a safe getaway. OFF TO VERDUN