On rising the next morning, he saw the raft and boats again approaching. Mr Tarwig came in command of them, with directions from the commander to choose a site for erecting a battery on the island with their guns. "The commander thinks it probable that the Spaniards, when they find out that we are here, will attack us for the sake of making us prisoners, and the sooner we are prepared for them the better," he said to Lieutenant Foley. While the other officers and men were engaged in landing the stores which the boats had brought, the two lieutenants walked together across the island, and then followed the rise which ran along the centre on the eastern side. Although there were many reefs on that side, the island was more approachable than on the west, where the _Champion_ had been wrecked, and after a careful survey they fixed on a spot below which it appeared that a ship might approach the shore. Consequently it was the spot which an enemy would probably choose for landing with boats. The lieutenants were not long in marking out the site of their proposed fort. The ground was here covered more thickly than, in other places with trees, some of considerable height, which would effectually mask it from the sea. The island was of a width which would enable the guns in the fort to defend it on both sides, as some might be so placed as to command their own landing-place, should an enemy attempt to come on shore on that side. Having formed their plan, they returned to the camp. Here all hands were still busily employed in getting the guns on shore. The difficulty was to drag them up to the site chosen for the fort. Their own carriages, which had been also landed, were of no use for this purpose; but the carpenter suggested that rollers should be placed under them, and, ropes being secured to the breeches, they could be dragged up by the crew. While the first lieutenant returned to the ship, Norman Foley directed the carpenter to form his proposed rollers, and to try what could be done with one of the guns. Some of the rigging had already been brought on shore on the raft, and there was an abundance of ropes for the purpose.