How long they would remain stationary Bob could not tell; but he thought he had them sufficiently well in hand to give him time to fly to the mine and act on another idea that had occurred to him. On reaching the house, he ordered Shan Tai to put up in two or three baskets a quantity of food, then scribbled a note bidding Lawrence push forward at his utmost speed. This he placed under the lid of a tin weighted with stones, but free from caps or dynamite. Then telling Gur Buksh to keep a careful watch on the track southward, and fire if the Kalmucks showed themselves at the turn half a mile away, he went back to the aeroplane, carrying the tin, and set off down the river. He was anxious that Lawrence should arrive before dark. In the daylight the dynamite bombs might be relied on to bar the road to the Kalmucks; but they might easily take advantage of the darkness to slip past the mine, if not by the track, at any rate by the hill-path above, and the bombs would lose half their terrors. The possibility of a collision between the Kalmucks and his brother's party filled him with anxiety; for the former, infuriated by their chevying, would wreak their vengeance upon the smaller band coming up-stream.

Bob discovered Lawrence and his men taking a rest about half-way between the mine and the broken bridge. They greeted him with a cheer. He flew for some minutes up- and down-stream in the search for a landing-place, but the track being too narrow here, and the neighbourhood too rugged, he swooped down, and as he passed over the group, he got Fazl to drop his tin within a few feet of them. The Gurkha uttered a cry of incredulous amazement when he heard the order, but Bob hastily explained that the tin contained only a chit. Too busy himself with steering to watch the result, Bob asked Fazl what had happened, and he reported that the tin, rolling down the bank towards the river, had been retrieved by Lawrence Sahib himself.

Bob flew straight back to the mine, thence over the Kalmucks, who were still halted where he had left them, and beyond them to the Pathans. The country was here much less rugged, but it was some little time before he found a spot where he could alight without risk, nearly half a mile south of the party. On landing, he and Fazl between them carried the baskets of food to the Pathans.

"The sahib is a light to our eyes," said the head man. "The men were becoming restless."

"I dare say. Well, here is some food for them. This will keep up their courage. I am glad to see that they have obeyed my orders, and before long I hope we shall all be safe at the mine."

"Allah be praised!" cried the man. "Food is what we need, and my brothers will delight in the sahib's care."

Indeed, Bob could have hit upon no more effective means of attaching the Pathans to his cause. This evidence of the sahib's thoughtfulness profoundly impressed the men, and as they made ravenous onslaught on their rations they were loud in praise of their young master, whom it was good to serve.

By this time Bob was very tired of his continual journeys up and down the river; his petrol, too, was running low, and it was with a feeling of great relief that he set off on what was to be his last flight for many a day. When Lawrence had returned, Bob meant to hold a serious consultation with him as to the possibility of holding the mine. If it were decided that this was hopeless, he would have to make immediate arrangements for evacuation. The thought of leaving the aeroplane gave him a pang. That he must leave it seemed inevitable, for he felt that his presence would be necessary as leader of the march. He might, indeed, fly miles ahead, alight, and wait for his little force to reach him; but it seemed more important to share his brother's difficulties than to secure the safety of the aeroplane.

After replacing the machine in its shed, he returned to the house and called for dinner. For several hours there was nothing to be done. When he had finished his meal, he lit his pipe and settled himself in an easy chair to think over the position. It was the first opportunity of rest and quiet meditation since Nurla Bai's defection had so fatally disturbed the peaceful life of the settlement. Of his uncle he could now think only as of one irrevocably lost. It was the end of mining in the Hindu Kush. Whatever the immediate future might bring forth, it was clear that Lawrence and he must seek some other career. And when he reckoned up the chances, he felt more and more doubtful whether either of them would escape from this valley of tragedy with their lives.

Yet Fate had been kind to them, even through the instrumentality of Nurla Bai. But for that man's villainy, there would have been no pursuit down the river, no discovery of the army encamped forty miles away. They would have had no warning of the approach of this great host, and defence and flight would have been equally impossible. Such chances as they had of weathering the storm were due to Nurla Bai.