However, to return to our dam. Billy helped me very diligently to pile up a dam of rocks, which was pretty laborious, for we had to haul them a good distance, and since it rained all the time we were constantly drenched, and I wonder we did not take an ague. We were about three days in doing it, and then, sure enough, as soon as it was done, the rain ceased, and Billy turned a triumphant countenance upon me, and asked what I thought of that. But I had the better of him next day, for the rain came again, and we saw with great delight that the stream was diverted by the dam into the narrow channel we had cut to bring it to our trench, and before long it was flowing through this in considerable volume, and fell into the lake. It nobly answered my expectations, for the loosened earth was not only more easy for us to dig with our rude spades, but it became mud as soon as it was dug up, and was washed away. We began to deepen the trench into a moat at the two ends opening on the lake, working backwards to the middle; but before we had done very much the rain ceased again, and the rivulet dried up. However, we were fairly come to the wettest part of the year, and the rainy days were more than the fine ones, so that in the course of a few months we had made good progress, and had indeed widened and deepened the whole trench, though not near so much as I should have liked. The part directly in front of our door was the deepest, and we made a kind of drawbridge, of the nature of a hurdle, to throw over it; not at this time, however, attempting any contrivance for raising or lowering it. [Sidenote: On the Watch] Though we went about our daily work with great regularity, we were never, I think, quite so cheerful as we had been before the visit of our whilom shipmates. The thought that they might come back kept us continually on the stretch, so to speak; we went up to our watch-tower, one or other of us, not twice a day, as before, but three or four times, and we never went to bed at night without an uneasy feeling that when we awoke we might find our enemies upon us. For several nights, indeed, Billy and I took turns to watch, though we soon gave it up, partly because it was so fatiguing, and partly because, when we considered of it calmly, we thought it very unlikely that the men would arrive in the darkness, for, not knowing the coast, they might very easily run upon a rock and lose their boat, a calamity which they would not risk.