Reinforced by Bob’s men, the party now opened fire with deadly effect, but the attackers were so numerous that the rush was scarcely checked. There was only time for a second volley before the head of the enemy’s column surged up against the breastwork. They had held their fire until they were able to see the dark forms of their adversaries. Then their shots, fired point-blank, laid low several of the Sikhs and Pathans. Supported by the swarms in their rear they began to clamber up the rampart, in the teeth of the bristling bayonets opposed to them. On their side was the advantage of numbers: on the side of the defenders that of position; but Bob recognised in a minute that his men, ply their bayonets as they might, must soon be overwhelmed by sheer weight. Suddenly a beam of light flashed over and past the scene of the conflict, resting on the track immediately beyond the breastwork, which was crowded with yelling Kalmucks pressing on to support their comrades. Gur Buksh in the compound had switched on the searchlight. It was not the blinding glare associated with the searchlights of forts and battleships, but it had sufficient illuminating power to show up the disorderly mass of the charging force. For a moment it made no alteration in the conditions. Bob and his brother, with barely a score of men left to them, were hard pushed to hold the breastwork. Faster than they could hurl the enemy down at the point of the bayonet, others swarmed up. Bob was on the point of shouting an order to retire to his own original breastwork up the track when, above the shouts and yells of the combatants, sounded the characteristic rattle of the machine gun. Instantly he recognised how this might operate in his favour. The gun could not be trained on the men who were actually at grips with him, but in a few seconds it had swept a huge gap in the column advancing in serried ranks along the track, and deprived his immediate assailants of their support. He at once took advantage of this fortunate diversion. Instead of retiring, he cried to the men to stand firm, and the desperate work at the rampart went on. For some time the Kalmucks there did not know or failed to appreciate what was happening behind them. They still pressed on and up, and but for the timely arrival of another dozen men despatched by Gur Buksh from the mine they might even now have carried the position. The reinforcement turned the scale. Bob called on his men for a final effort, and he and Lawrence flashed their revolvers in the very faces of the crowd. Fired by their example the men thrust and jabbed with redoubled energy, and in a few minutes hurled the last of the assailants back on to the track.