In short, he went, as was proper and incumbent on him in such critical circumstances, to take a great risk, in hope of a favourable chance offering.

On the 9th, as before stated, he anchored off Point Judith, and opened communications with the garrison, from which he learned the events that had so far occurred, and also that the enemy was well provided with craft of all kinds to make a descent upon any part of the Island.
As deGrasse at Yorktown, when rumour announced the approach of a British fleet, was deterred only by the most urgent appeals of Washington from abandoning his control of the Chesapeake, essential to the capture of Cornwallis, so now d'Estaing, in Narragansett Bay, was unwilling to keep his place, in face of Howe's greatly inferior squadron.[31] The influence exerted upon these two admirals by the mere approach of a hostile fleet, when decisive advantages depended upon their holding their ground, may be cited plausibly in support of the most extreme view of the effect of a "fleet in being;" but the instances also, when the conditions are analysed, will suggest the question: Is such effect always legitimate, inherent in the existence of the fleet itself, or does it not depend often upon the characteristics of the man affected?
The contemporary British narrative of these events in Narragansett Bay, after reciting the various obstacles and the inferiority of the British squadron, says: "The most skilful officers were therefore of opinion that the Vice-Admiral could not risk an attack; and it appears by his Lordship's public letter that this was also his own opinion: under such circumstances, he judged it was impracticable to afford the General any essential relief." In both these instances, the admirals concerned were impelled to sacrifice the almost certain capture, not of a mere position, but of a decisive part of the enemy's organised forces, by the mere possibility of action; by the moral effect produced by a fleet greatly inferior to their own, which in neither case would have attacked, as things stood.

What does this prove?
Immediately upon Howe's appearance, the French seamen who had landed the day before on Conanicut were recalled to their ships.

The next morning, August 10, at 7 A.M., the wind came out strong at north-east, which is exceptional at that season.

D'Estaing at once put to sea, cutting the cables in his haste.