"A good soldier should always arrange for an orderly retirement," remarked the colonel thoughtfully, "for it is not always wise to burn your boats behind you, or destroy your bridges. I must confess that in this case we shall be wise to do as my son suggests, for it will help us to fight the harder if we possess the knowledge that retreat is possible. At the same time, I am quite sure that we are men enough to stand to our guns to the very last, and, in spite of a means of retirement, to stick to our position so long as it is tenable."
"Hear, hear!" sang out John Margetson, who, as the danger increased, seemed to become more cheerful. "Both of you have made most excellent proposals, and, as they do not need seconding, I shall show my approval by at once volunteering to form one of the exploring party."
"Then Jim had better go with you, my friend. I will remain here with Ali, and when you hear a shout, come back to us as fast as you can."
The question having thus been settled, and it being evident that there was no time for delay, the two who had been selected for the enterprise left their weapons on the edge of the sandbank, and, crawling from the trench, crept to the left, where they were quickly out of the range of the bullets. Then they sprang to their feet and ran to the fire, which still smouldered, and, snatching a couple of the largest brands, stepped towards the many openings which ran from the entrance-hall into the workings of the mine.
"Which one?" asked John Margetson, holding his torch aloft. "All are of exactly the same size and appearance, so that it is difficult to make a choice."
"Then I vote for the central arch," cried Jim. "Come along."
Darting across the intervening space, which was swept by a cloud of bullets, they plunged into the dark opening, and then, with firebrands held well in front of them, advanced at as rapid a pace as possible. They found themselves in a tunnel, which was of sufficient height to allow them to stand easily. A glance on either side showed them that the walls were composed of bare rock, or of sandstone, while the roof was supported at short intervals by buttresses of stone on either hand, and by a girder of the same material stretched from summit to summit. Like the hall and the ravine outside, the floor was paved with square blocks, but in parts these had caved in, and the recesses were filled with dark pools of water. Elsewhere falls of the roof and of the sides had taken place, and obstructed the passage, but in no place did it close it completely. Indeed, in view of the fact that hundreds of years had probably passed since the workings had been constructed, their condition was marvellous, and reflected the greatest credit upon those who had slaved at their construction.
But Jim and his comrade had little time for observing all these points, for they were conscious that their pressing needs would admit of no delay. Avoiding, therefore, the depressions and crevices in the floor, and clambering over the mounds formed by fallen rocks and débris from the roof above, they pushed on at a pace which brought them many a bruise from projecting obstacles. But they never seemed to heed them, and, scrambling along, had quickly traversed some two hundred yards of the tunnel. At this point they came to a crossway, where a passage ran to right and left.
"I should think that our best plan will be to take the direct road," said Jim, coming to a halt. "However, we will just see where these two tunnels lead to. You take that on the right, John, while I go to the left. If after walking some twenty yards you find nothing extraordinary, return at once, and meet me here."
Without discussing the question further, they separated at once. When they met again in the space of a couple of minutes, each reported that the crossway opened into a parallel tunnel a few yards away, and into still another farther on.