Suddenly a curious sound fell on his ears. It was so faint that at first he doubted the evidence of his senses. Then as the wind fell it came louder. It was exactly like some hollow piece of metal being struck by a stick, musical and oddly resonant.
He concluded it was the wind blowing a branch of a tree against an old boiler in the ruin before him. The trouble was that there was scarcely enough wind now for that in this sheltered cup.
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.
Fate suddenly gave him the right chance. The unseen figure stood up and moved a step, till his back was against the parados. He actually brushed against Peter's elbow, who held his breath.
There is a catch that the Kaffirs have which would need several diagrams to explain. It is partly a neck hold, and partly a paralysing backward twist of the right arm, but if it is practised on a man from behind, it locks him as sure as if he were handcuffed. Peter slowly got his body raised and his knees drawn under him, and reached for his prey.
He got him. A head was pulled backward over the edge of the trench, and he felt in the air the motion of the left arm pawing feebly but unable to reach behind.
'Be still,' whispered Peter in German; 'I mean you no harm. We are friends of the same purpose. Do you speak German?' 'Nein,' said a muffled voice.
'English?'
'Yes,' said the voice.
'Thank God,' said Peter. 'Then we can understand each other. I've watched your notion of signalling, and a very good one it is. I've got to get through to the Russian lines somehow before morning, and I want you to help me. I'm English - a kind of English, so we're on the same side. If I let go your neck, will you be good and talk reasonably?'
The voice assented. Peter let go, and in the same instant slipped to the side. The man wheeled round and flung out an arm but gripped vacancy.
'Steady, friend,' said Peter; 'you mustn't play tricks with me or I'll be angry.'
'Who are you? Who sent you?' asked the puzzled voice.
Peter had a happy thought. 'The Companions of the Rosy Hours,' he said.
'Then are we friends indeed,' said the voice. 'Come out of the darkness, friend, and I will do you no harm. I am a good Turk, and I fought beside the English in Kordofan and learned their tongue. I live only to see the ruin of Enver, who has beggared my family and slain my twin brother. Therefore I serve the Muscov ghiaours.'
'I don't know what the Musky jaws are, but if you mean the Russians I'm with you. I've got news for them which will make Enver green. The question is, how I'm to get to them, and that is where you shall help me, my friend.'
'How?'
'By playing that little tune of yours again. Tell them to expect within the next half-hour a deserter with an important message. Tell them, for God's sake, not to fire at anybody till they've made certain it isn't me.'
The man took the blunt end of his bayonet and squatted beside the bell. The first stroke brought out a clear, searching note which floated down the valley. He struck three notes at slow intervals. For all the world, Peter said, he was like a telegraph operator calling up a station.
'Send the message in English,' said Peter.
'They may not understand it,' said the man.
'Then send it any way you like. I trust you, for we are brothers.'
After ten minutes the man ceased and listened. From far away came the sound of a trench-gong, the kind of thing they used on the Western Front to give the gas-alarm.
'They say they will be ready,' he said. 'I cannot take down messages in the darkness, but they have given me the signal which means "Consent".'
'Come, that is pretty good,' said Peter. 'And now I must be moving. You take a hint from me. When you hear big firing up to the north get ready to beat a quick retreat, for it will be all up with that city of yours. And tell your folk, too, that they're making a bad mistake letting those fool Germans rule their land. Let them hang Enver and his little friends, and we'll be happy once more.'
'May Satan receive his soul!' said the Turk. 'There is wire before us, but I will show you a way through. The guns this evening