At length, after a pull of not less than seventy-two hours, the boats' crews had the satisfaction of hearing that they were only two or three miles from the fort in which the Nicaraguan forces were posted. A somewhat limited space only could be found on the shore for their encampment, so that a greater number than usual took up their quarters in the boats. As may be supposed, a careful search was made for ants' nests, rattle-snakes' holes, and the abodes of any other creatures likely to disturb them. A larger number of sentries than usual were also posted round the camp and directed to keep a vigilant watch, while one of the gigs under charge of Higson, with Needham as coxswain, was sent on some way ahead to keep a lookout for the enemy, should they take it into their heads to descend the stream, and make a night attack on the camp. A pleasant supper was made on shore, though singing and loud talking were forbidden, lest any stragglers from the fort might hear them and give notice of their approach. The thick forest, however, effectually screened their fires, and the smoke could not be seen at night. Mr Wilmot spoke hopefully of the work before them. He had little doubt that the Nicaraguan commander would yield immediately he saw the force brought against him, though he probably at present did not believe that such heavy boats as theirs could be forced up the stream. Mr Halliday was more silent than was his wont. Some of his friends inquired what was the matter. "I have felt the heat very great during the day," he answered; "but I dare say that when our work is accomplished, and we are pulling down the stream, I shall recover my spirits." Mr Wilmot had kindly invited the three midshipmen to take up their quarters on board his boat, having fitted up a place amidships for them; here, at all events, they might be free from the ants; and as to the mosquitoes, they were nearly inured to them. At an earlier hour than usual all hands not on the watch went to sleep, with the exception of those in Mr Wilmot's boat. He and his friend sat up some time talking together, but what they said neither Tom nor his companions could hear, as they themselves were soon lulled to sleep by the loud rushing of the strong current which swept by the boat.