The soldiers at the disposal of the intrepid adventurers were a mere handful, scarcely 500 in all, but perhaps that fact added the necessary spice of danger. Nelson left his ship, and “carried troops in boats one hundred miles up a river, which none but Spaniards since the time of the buccaneers had ever ascended,” to use his own words. He “boarded” an outpost of the enemy, situated on an island in the river; “made batteries, and afterwards fought them, and was a principal cause of our success.” When the miniature expedition arrived at Fort San Juan the rainy season had commenced, bringing malaria in its train. Nelson was all for making an immediate attack, but Polson ruled the slower, and perhaps surer, method of erecting batteries and so forth, in which Nelson lent a willing hand. “I want words to express the obligations I owe to Captain Nelson,” Polson told Governor Dalling. “He was the first on every service, whether by day or night. There was not a gun fired but was pointed by him, or by Captain Despard, Chief Engineer.” Fever played havoc with the men; of the 200 sailors of the _Hinchinbrook_, no fewer than “eighty-seven took to their beds in one night; and of the two hundred, one hundred and forty-five were buried in mine and Captain Collingwood’s[9] time: and I believe very few, not more than ten, survived of that ship’s crew; a proof how necessary expedition is in those climates.” Nelson’s own health was undermined by dysentery. A few hours before the Spanish flag gave place to the Union Jack he left the region of the fort in order to join the _Janus_ (44 guns), of which he had been given command. The ship being stationed at Jamaica, he was taken to Port Royal in a sloop. Here he met with a good and tender-hearted friend in Lady Parker, the wife of Sir Peter Parker, Commander-in-Chief at Jamaica, but he gained so little in strength that he was compelled to ask leave of absence and leave the West Indies for England. Had he stayed it is improbable that he could have rendered useful service while in such a low condition. The expedition eventually ended in failure. He sailed on the 4th September 1780 in the _Lion_, commanded by Captain the Hon. William Cornwallis, a younger son of Earl Cornwallis, who acted the part of nurse to the patient’s entire satisfaction, and cemented a friendship which lasted until Nelson’s death. Having to resign the _Janus_ probably caused Nelson more torture than his physical suffering, for he was intensely ambitious. It is stated that when he arrived in England he would not proceed to Bath to drink the waters until he had been conveyed to the Admiralty to beg for another vessel. “This they readily promised me,” he observed in a humorous way, “thinking it not possible for me to live.” At Bath he stayed with Mr Spry, an apothecary, who resided at 2 Pierrepont Street; his medical adviser was Dr Woodward.