The castle of San Juan is 32 miles below the point where the river issues from the Lake of Nicaragua, and 69 from its mouth. Boats reach the sea from thence in a day and a-half; but their navigation back, even when unladen, is the labour of nine days. The English appeared before it on the 11th, two days after they had taken San Bartolomeo. Nelson's advice was, that it should instantly be carried by assault; but Nelson was not the commander; and it was thought proper to observe all the formalities of a siege. Ten days were wasted before this could be commenced. It was a work more of fatigue than of danger; but fatigue was more to be dreaded than the enemy; the rains set in; and could the garrison have held out a little longer, diseases would have rid them of their invaders. Even the Indians sunk under it, the victims of unusual exertion, and of their own excesses. The place surrendered on the 24th. But victory procured to the conquerors none of that relief which had been expected; the castle was worse than a prison; and it contained nothing which could contribute to the recovery of the sick, or the preservation of those who were yet unaffected. The huts which served for hospitals were surrounded with filth, and with the putrefying hides of slaughtered cattle--almost sufficient of themselves to have engendered pestilence; and when at last orders were given to erect a convenient hospital, the contagion had become so general that there were none who could work at it; for besides the few who were able to perform garrison duty, there were not orderly men enough to assist the sick. Added to these evils, there was the want of all needful remedies; for though the expedition had been amply provided with hospital stores, river craft enough had not been procured for transporting the requisite baggage; and when much was to be left behind, provision for sickness was that which of all things men in health would be most ready to leave. Now, when these medicines were required, the river was swollen, and so turbulent that its upward navigation was almost impracticable. At length even the task of burying the dead was more than the living could perform, and the bodies were tossed into the stream, or left for beasts of prey, and for the gallinazos--those dreadful carrion birds, which do not always wait for death before they begin their work. Five months the English persisted in what may be called this war against nature; they then left a few men, who seemed proof against the climate, to retain the castle till the Spaniards should choose to retake it and make them prisoners. The rest abandoned their baleful conquest. Eighteen hundred men were sent to different posts upon this wretched expedition: not more than three hundred and eighty ever returned. The HINCHINBROOK's complement consisted of two hundred men; eighty-seven took to their beds in one night, and of the whole crew not more than ten survived.