Before he did this, however, he took all the wise precautions necessary to insure, as far as possible, the safety of the old castle, and in some respects this was not a difficult task, for Singleton Towers stood at the head of a narrow arm of the sea, which on three sides completely surrounded it, leaving only the east side assailable by land. On the sides of the sea the castle rose perpendicularly from the water, the only entrance being by way of a creek, half cave, half boathouse, the entrance to which could at pleasure be barred by a portcullis. This precaution Singleton took, and had the satisfaction of feeling that on its seaboard at least the castle was as secure as if a garrison of a hundred men watched it. On the land side, however, security was not so possible. The water was continued in the form of a ditch twelve yards wide round this side also; but it was a narrow protection at the best. The drawbridge which spanned it was, as we have already seen, drawn up; and the great iron gate connecting with the outside world, carefully barred and bolted. Still, as Singleton looked down, he felt concerned to think how easily a few bold men could swim the moat and assault the place. But he was in for it now! As auld Geordie had said, the guns of the castle were all loaded and ready for action; and Singleton was relieved to see that one of these was mounted on the turret over the great gate; and a further discovery relieved him still more, and that was that the woods on this side were so dense that, except along the narrow clearing through the trees, it would hardly be possible for any number of troops, especially if they brought artillery, to approach. He therefore took advantage of the moonlight to point the gun carefully so as exactly to cover the entrance to this narrow path, a precaution which, as will be seen, stood him in good stead before the night was out. As to the other guns, there was one on the east terrace, rusty and old- fashioned, but happily loaded; and there were others at various corners and buttresses, all of which the young laird inspected and ascertained to be ready for any emergency. He also placed muskets in readiness at various points in case of need. All these preparations occupied a long time in effecting, and it was not till an hour had passed since the departure of his men that Singleton felt able to take his place on the watch, and quietly await the result of his venture.