What other end could they have in view? The valley ran southward, and led ultimately of course to India, but an invasion of India by this route was too ridiculous to be considered seriously. Ambitious as the Mongol prince was, it was scarcely conceivable that he could entertain such a notion, unless he had taken leave of his senses. The twenty thousand men now encamped at the mouth of the valley would need to be multiplied ten or twenty times before there would be the slightest chance of success. There might, in truth, be many more such army corps massed farther northward; but the task of pushing an invading force, adequate to the undertaking, through the narrow gorges of the valley, where for long stretches three horsemen could not ride abreast, with the necessary artillery, ammunition wagons and commissariat, would prove too much for the most consummate military organizer. It would take so long that a defending force on the north-west frontier could cut up the more advanced sections long before the rest could move up to their support. In short, the whole idea was fantastic, and Bob called himself an ass for even thinking of it. Giving up this question as beyond his conjecture, Bob bent his mind upon the problem that immediately concerned him. This was a sufficiently hard nut to crack. The Kalmucks, whatever their ultimate intention might be, were clearly to be regarded as enemies. On that point their actions were quite conclusive. Whether he owed their aggressiveness to Nurla Bai or not, they were a menace to the mine and its owners. Nurla Bai would certainly take advantage of their proximity to attempt to capture the settlement, and no doubt could command the assistance of as many men as he needed. It is not surprising that Bob’s heart sank with dismay as he reckoned up the puny force he had to pit against such overwhelming numbers. Of all his people, only the handful of Sikhs were trained to war. The Pathans were warriors by nature, but he doubted how far he could rely on their loyalty. At present, it was true, they were deeply incensed against the Kalmucks; but whether they, if called upon, would take definite sides against their racial enemies in face of the enormous odds arrayed against them, was a matter on which there was room for grave doubt. The Kalmuck labourers at the mine were a further complication. They would certainly make common cause with their own countrymen as soon as these came within striking distance. Alone they out-numbered the Sikhs and Pathans by two to one.