Our mine-laying craft very rarely got to work before one or two o'clock in the morning, that being the hour when human vigilance is popularly supposed to be least active; I therefore planned to arrive in the roadstead about midnight, hoping that I should then catch the enemy off his guard, snatching a rest in preparation for the moment when our activities usually began. Now, the thing which we had most to fear was a long-distance searchlight established in a station on Golden Hill, at a height of some two hundred feet above the sea-level. This searchlight was generally turned on at dusk, and was kept unceasingly playing upon the anchorage and its adjacent waters all through the night. It commanded the entire roadstead, from a point three miles east of the harbour's mouth, right round to the south and west as far as the Pinnacle Rock; and the difficulty was how to avoid being picked up by it before we had delivered our attack. But by this time I knew the seaward surroundings of Port Arthur almost by heart. I knew, for instance--and this was most important--that the searchlight station was placed so far back from the edge of the crumbling cliff that the water immediately at the foot of the latter, and for a distance of perhaps a hundred yards to seaward, could not be reached by the beam of the light, and was therefore enveloped in darkness, rendered all the deeper and more opaque by the dazzling brilliance of the light; and I also knew that along the outer edge of this patch of darkness there was a sufficient depth of water to float a destroyer, even at dead low water. My plan, therefore, was to make a wide sweep to seaward upon leaving the blockading squadron, gradually turning east and north, and thus eventually to get into Takhe Bay, some five miles east of Port Arthur anchorage, and from thence creep along the shore to the westward, keeping as close in as the depth of water would permit. There was only one difficulty about this, which was that at a certain point not far from where the searchlight station stood, there was a gap in the line of cliff where the ground sloped steeply down to the water's edge for a short distance, and here of course the beam of the light had uninterrupted play right up to the beach; but I believed I could overcome this difficulty by simply watching my opportunity and slipping past the gap when the searchlight was not playing upon it.