Several large bundles of bamboos, cut into lengths six feet long, and sharpened at both ends, had been among the articles taken up to the battery, and while most of the men were engaged filling and carrying the sacks of earth, some were employed in constructing chevaux de frise, ten paces on each side of the spot where the battery was being constructed. The bamboos were set diagonally a foot and a half into the soft earth, and bound together by being lashed to strong poles running along them. These fences extended from the edge of the bushes by the water to the trees. The forest behind was so thick and entangled with creepers that there was little fear of an attack being made from that quarter.

Accustomed to work in the darkness, the sailors had no difficulty in carrying out the operation, and before morning broke the battery was complete. It was six feet high on the side facing the water, with two embrasures for the guns, four feet high on the sides covered by the chevaux de frise. The front face was twenty-five feet in length, the sides forty. Morning was breaking as the work was finished, and bread and cold meat were served out, with a full ration of grog. By the time these were consumed it was broad daylight; for there is little twilight so near the equator.