But as he listened he caught the note again. It was a bell, a fallen bell, and the place before him must have been a chapel. He remembered that an Armenian monastery had been marked on the big map, and he guessed it was the burned building on his right.

The thought of a chapel and a bell gave him the notion of some human agency. And then suddenly the notion was confirmed. The sound was regular and concerted—dot, dash, dot—dash, dot, dot. The branch of a tree and the wind may play strange pranks, but they do not produce the longs and shorts of the Morse Code.

This was where Peter’s intelligence work in the Boer War helped him. He knew the Morse, he could read it, but he could make nothing of the signalling. It was either in some special code or in a strange language.

He lay still and did some calm thinking. There was a man in front of him, a Turkish soldier, who was in the enemy’s pay. Therefore he could fraternize with him, for they were on the same side. But how was he to approach him without getting shot in the process? Again, how could a man send signals to the enemy from a firing-line without being detected? Peter found an answer in the strange configuration of the ground. He had not heard a sound until he was a few yards from the place, and they would be inaudible to men in the reserve trenches and even in the communication trenches. If somebody moving up the latter caught the noise, it would be easy to explain it naturally. But the wind blowing down the cup would carry it far in the enemy’s direction.

There remained the risk of being heard by those parallel with the bell in the firing trenches. Peter concluded that that trench must be very thinly held, probably only by a few observers, and the nearest might be a dozen yards off. He had read about that being the French fashion under a big bombardment.

The next thing was to find out how to make himself known to this ally. He decided that the only way was to surprise him. He might get shot, but he trusted to his strength and agility against a man who was almost certainly wearied. When he had got him safe, explanations might follow.

Peter was now enjoying himself hugely. If only those infernal guns kept silent he would play out the game in the sober, decorous way he loved. So very delicately he began to wriggle forward to where the sound was.

The night was now as black as ink around him, and very quiet, too, except for soughings of the dying gale. The snow had drifted a little in the lee of the ruined walls, and Peter’s progress was naturally very slow. He could not afford to dislodge one ounce of snow. Still the tinkling went on, now in greater volume. Peter was in terror lest it should cease before he got his man.

Presently his hand clutched at empty space. He was on the lip of the front trench. The sound was now a yard to his right, and with infinite care he shifted his position. Now the bell was just below him, and he felt the big rafter of the woodwork from which it had fallen. He felt something else—a stretch of wire fixed in the ground with the far end hanging in the void. That would be the spy’s explanation if anyone heard the sound and came seeking the cause.

Somewhere in the darkness before him and below was the man, not a yard off. Peter remained very still, studying the situation. He could not see, but he could feel the presence, and he was trying to decide the relative position of the man and bell and their exact distance from him. The thing was not so easy as it looked, for if he jumped for where he believed the figure was, he might miss it and get a bullet in the stomach. A man who played so risky a game was probably handy with his firearms. Besides, if he should hit the bell, he would make a hideous row and alarm the whole front.