At last twilight came, and following that the night, dark and starless. Then the Lieutenant emerged from his hiding-place, and, standing in the middle of the field, wondered what direction he should take. He had no compass, of course, and the country around was an uncharted sea to him. Presently he noticed in the far distance a bright light shining, and, for no particular reason, set off in that direction. As he advanced the light suddenly disappeared nor did it blaze out again during the rest of his tramp. "Funny," he murmured. "It wasn't a searchlight, and it couldn't very well be a signal." After about an hour's walk, he found himself near a large enclosure with a long shed in the centre surrounded by a number of small huts. Also he caught sight of a dim figure pacing mechanically to and fro some distance in front of him and outside the enclosure--obviously a sentry. At first he thought it must be a prison encampment and was about to move stealthily away again, when the bright light which had first attracted his attention, suddenly lit up the enclosure. It came from a large arc-lamp suspended from a high wooden erection, and in the glare Lawless recognised the shed as an aeroplane hangar. Evidently, therefore, this was an aviation station, and the light served as a guide to the homeward bound machines. This view was confirmed a few moments later when there came the sound of a distant hum which gradually grew louder and more distinct. Lawless, impelled more by curiosity than anything else, crawled nearer to the enclosure and took "cover" behind a pile of wooden stakes which were being used in the repairing of the palisades. The sentry had ceased his monotonous pacing to and fro, and now stood, resting on his rifle, looking skywards in the direction of the approaching aeroplane. At last it came into view, flying rather low, and then the pilot volplaned to the ground, alighting within the enclosure and bringing his machine to a standstill not twenty yards from the spot where the Lieutenant was concealed. The aviator sprang out, followed by the observer, and they both hurried towards one of the huts, leaving the machine where it stood.