But amidst this confidence in the success of the French arms, the means for ensuring it were gradually neglected. The valour of the intrepid and prudent commander was doubtless equal to the minor vicissitudes of war, but whilst the length of the delay paralysed his activity, nature herself suddenly proved fatal to this hitherto victorious army: pestilences began to rage among the troops, and human courage could no longer withstand the “far-shooting arrows of the god of day.” The consequence was, that within the space of seven weeks, out of the whole host which up to that period had been eager for combat, a mere handful remained, consisting of a few thousands of cadaverous figures, who were almost incapable of bearing arms or of following the commands of their sick leaders. On the 29th of August the siege was raised, fifteen days after the heroic Lautrec, bowed down by chagrin and disease, had resigned his breath; the wreck of the army retreated amid thunder and heavy rain[499], and were soon captured by the imperialists, so that but few of them ever saw their native land again. This siege brought still greater misery upon France than even the fatal battle of Pavia, for about 5000 of the French nobility, some from the most distinguished families, had perished under the walls of Naples; its remoter consequences too were humiliating to the king, and the people; since owing to its failure all those hitherto feasible schemes were blighted, which had for their object the establishment of French dominion beyond the Alps. It behoves us, therefore, to pay so much the more attention to those essential causes of this event, which fall within the province of medical research. The mortality which occurred in the camp, began probably as early as June, after the usual calamities which surround an army in an enemy’s country. The French and Swiss were insatiable in their indulgence in fruit, which the gardens and fields furnished them in abundance, whilst there was a scarcity of bread and of other proper food[500]. Hence fevers soon broke out, which increased in malignity the longer they existed, accompanied no doubt by debilitating diarrhœas, which never fail to make their appearance under circumstances of this kind, and are in themselves among the most pernicious of camp diseases, since they not only destroy in the individual case by the exhaustion which they occasion, but likewise by infecting the air, prepare the way for the worst pestilences.