John began to think now of Lannes. Would he come? Was Weber right when he credited to him a knowledge near to omniscience? How was it possible for him to pick out a friend in all that huge morass of battle! And yet he had a wonderful, almost an unreasoning faith in Philip, and, as always when he thought of him, he looked up at the heavens.
It was an average night, one in which large objects should be visible in the skies, and he saw several aeroplanes almost over their heads, while the rattle of a dirigible came from a point further toward the east.
The aeroplane was bound to be German, but as John looked he saw a sleek shape darting high over them all and flying eastward. Intuition, or perhaps it was something in the motion and shape of the machine, made him believe it was the _Arrow_. It must be the _Arrow_! And Lannes must be in it! High over the army and high over the German planes it darted forward like a swallow and disappeared in a cloud of white mist. His hair lifted a little, and a thrill ran down his spine.
He still looked up as he walked along, and there was the sleek shape again! It had come back out of the white mist, and was circling over the German planes, flying with the speed and certainty of an eagle. He saw three of the German machines whirl about and begin to mount as if they would examine the stranger. But the solitary plane began to rise again in a series of dazzling circles. Up, up it went, as if it would penetrate the last and thinnest layer of air, until it reached the dark and empty void beyond.
The _Arrow_--he was sure it could be no other--was quickly lost in the infinite heights, and then the German planes were lost, too, but they soon came back, although the _Arrow_ did not. It had probably returned to some point over the French line or had gone eastward beyond the Germans.
John felt that he had again seen a sign. He remembered how he and Lannes had drawn hope from omens when they were looking at the Arc de Triomphe, and a similar hope sprang up now. Weber was right! Lannes would come to his rescue. Some thought or impulse yet unknown would guide him.
Light clouds now drifted up from the southwest, and all the aeroplanes were hidden, but the heavy murmur of the marching army went on. The puffing and clashing of innumerable automobiles came from the roads also, though John soon ceased to pay attention to them. As the hours passed, he felt an increased weariness. He had sat still almost the whole day, but the strain of the watching and waiting had been as great as that of the walking now was. He wondered if the guards would ever let them stop.