On the 11th the great galley and two small ones, approached within gun-shot of the town; but they were repulsed by guns and bombs from the fort, and the General followed them in his cutter, with attendant boats, well manned, till he got under the cannon of their ships, which lay in the sound.

This naval approach, as appeared afterwards, was in consequence of a concerted plot.  It seems that, at the commencement of the siege of St. Augustine, a Spanish officer quitted one of the outer forts and surrendered himself to Oglethorpe, who detained him prisoner of war.  He was readily communicative, and gave what was supposed important information.  After the close of the war, he might have been exchanged; but he chose to remain, pretending that the Spaniards looked upon him as a traitor.  He, at length, so artfully insinuated himself into favor with the magnanimous Oglethorpe, that he was treated with great courtesy.  On this invasion he begged permission to retire into the northern colonies of the English, saying that he apprehended that if he should fall into the hands of the Spaniards, they would deal rigorously with him.  The General, not being aware of any treacherous design, gave him a canoe to go up the river till he was out of danger; whence he might proceed by land to some back settlement.  Some days past and he came back to Frederica, pretending that he could not make his way through, nor by, the fleet without being discovered and captured.  Most fortunately, some days after his return, an English prisoner, who had escaped from one of the ships of war, acquainted the General with the treachery of this officer, assuring him that he had been aboard at such a time, and talked over his insidious project of setting fire to the arsenal which contained all the powder and military stores, and that its explosion should be the signal to the Spanish galleys to approach, and, in the confusion of the occasion, make an assault upon the fort.  This disclosure confirmed suspicions which had been excited by some of his management since his return; and he was put under guard.  In consequence of this precaution, the concerted signal could not be given; and the ruinous project was most happily defeated.[1]

[Footnote 1:  URLSPURGER, IV. p. 1260.]

July 12th, two English prisoners who had effected an escape, one from the fleet, and one from the camp, informed the General that the Spaniards, not having anticipated such vigorous resistance, had become restless and dispirited, especially since they had ascertained by their roll how great was their loss of men; and that the state of the wounded was distressing.  They added that these discomfitures were increased by the want of water on board the ships, which was so great that the troops were put upon half allowance, which, in this hot weather was a grievous deprivation, and that several, from the effect of the climate, were sick and unfit for service.  They apprized him, also, that they had holden a council of war, in which there were great divisions, insomuch that the troops of Cuba separated from those of Augustine, and encamped at a distance near the woods.