No machines, either French or German, were in sight. Irving had disappeared some time before we reached the balloon. I had not seen Drew from the moment when he fired his rockets. He waited until he made sure that I was following, then started for the west side of the salient. I did not see him, because of my interest in those clouds of blue bubbles which were rising with anything but bubble-like tranquillity. When I was clear of them, I set my course westward and parallel with the enemy lines to the south. I had never flown so low, so far in German territory. The temptation to forget precaution and to make a leisurely survey of the ground beneath was hard to resist. It was not wholly resisted, in fact. Anti-aircraft fire was again feeble and badly ranged. The shells burst far behind and above, for I was much too low to offer an easy target. This gave me a dangerous sense of safety, and so I tipped up on one side, then on the other, examining the roads, searching the ruins of villages, the trenches, the shell-marked ground. I saw no living thing; brute or human; nothing but endless, inconceivable desolation. The foolishness of that close scrutiny alone, without the protection of other _avions_, I realize now much better than I did then. Unless flying at six thousand metres or above,--when he is comparatively safe from attack,--a pilot may never relax his vigilance for thirty seconds together. He must look behind him, below, above, constantly. All aviators learn this eventually, but in the case of many new pilots the knowledge comes too late to be of service. I thought this was to be my experience, when, looking up, I saw five combat machines bearing down upon me. Had they been enemy planes my chances would have been very small, for they were close at hand before I saw them. The old French aviator, worn out by his five hundred hours of flight over the trenches, said, "Save your nervous energy." I exhausted a three-months reserve in as many seconds. The suspense, luckily, was hardly longer than that. It passed when the patrol leader, followed by the others, pulled up in _ligne de vol_, about one hundred metres above me, showing their French _cocardes_. It was the group of protection of Spa. 87. At the time I saw Drew, a quarter of a mile away. As he turned, the sunlight glinted along his rocket-tubes. A crowded hour of glorious life it seems now, although I was not of this opinion at the time. In reality, we were absent barely forty minutes. Climbing out of my machine at the aerodrome, I looked at my watch. A quarter to twelve. Laignier, the sergeant mechanician, was sitting in a sunny corner of the hangar, reading the "Matin," just as I had left him. Lieutenant Talbott's only comment was: "Don't let it worry you. Better luck next time. The group bagged two out of four, and Irving knocked down a Boche who was trying to get at you. That isn't bad for half an hour's work."