So as soon as Uncle Bob had gone to lie down, and I had begun my half of the watch, I fastened up Piter, took out my heavy trap, carried it down to the edge of the dam, and carefully felt the wall for the place I had marked by driving in a little nail.

I soon found it, placed my trap exactly beneath it, and wrenching down the spring by means of the lever, I tried to set it.

I had practised doing this in my own place, and could manage it pretty well, but in the darkness and excitement that troubled me now, it proved to be an exceedingly difficult job. Twice I managed to get it set, and was moving away when it went off with a startling clang that made me jump, and expect to see Uncle Bob come running out, especially as the dog set up a furious bark.

I quieted Piter though each time, and went and tried again till I managed my task, having to take great care that I did not hoist myself with my own petard, for it was a terribly dangerous engine that I was setting, though I did not think so then.

It was now set to my satisfaction, and being quite prepared with a big hammer, my next task was to drive in the lever like a peg right through the ring and up to the head, so that if I did catch my bird, there would be no chance of his getting away.

I felt about in the dark for a suitable place, and the most likely seemed to be just at the extent of the five feet of chain, which reached to the edge of the dam, where, between two of the big stones of the embankment, I fancied I could drive in the lever so that it could not be drawn out.

So taking the steel bar with the sharp edge I ran it through the ring, directed the point between two blocks of stone, and then began to drive.

As I said I was well prepared, having carefully thought out the whole affair, and I had bound several thicknesses of cloth over the head of the hammer like a pad so as to muffle the blows, and thus it was that I was able to drive it home without much noise.

At first it went in so easily that I was about to select a fresh place, but it soon became harder and firmer, and when I had done and felt the head it was quite immovable, and held the ring close down to the stones.

My idea had been to cover the trap with a handful or two of hay, but it was so dark that I thought I would leave it, as it was impossible to see it even from where I looked. I left it, meaning to come the next morning and set it free with a file, for I did not want to take up the peg, and I could get another for lever and join the chain with a strong padlock the next time.