Whether any considerable number of men were either killed or wounded in these very languid operations is doubtful, but both fleets certainly lost heavily from a cause which, throughout the whole of this and the following two centuries, was far more destructive than the sword. Hardly had King Henry VIII. left Portsmouth when his generals began to report to him the prevalence of sickness in his fleet; while the plague broke out amongst the French at St. Helens, even if it had not begun before they left Havre. Overcrowding, dirt, and salt food were universal in old fleets, and they produced their natural effects. We are probably well within the mark in supposing that for every man killed in action, or mortally wounded, fifty died of fever or the plague, and this continued to be the rule until well past the middle of the eighteenth century. What between disappointment at the obstinacy of the English in not fighting him on his own terms, the timidity of his pilots, and want of enterprise, D'Annebault, after spending several days in this futile manner, sailed away from St. Helens, coasting along Sussex, and making, as before, small plundering attacks, which even seem to have been very badly conducted, and could in any case serve no purpose except to embitter the already sufficiently savage hostility of the two countries. After a few days of this, he stood over to the coast of France, and near Boulogne landed not only four thousand soldiers, but three thousand pioneers, who had been supplied to him for the purpose of erecting the fortifications in the Isle of Wight. Even after this he still thought himself sufficiently strong to return to the English coast, and he reappeared accordingly in a few days.
On their return to the coast of England, the French made no attempt to renew the attack on the Isle of Wight. They prowled along the shores of Sussex and of Kent in what reads like a very aimless manner. If they had any definite object, it was to prevent the English from sending reinforcements to Boulogne. On the whole, it does appear likely that they had some such purpose, for the general direction of their cruise was towards the narrow seas. So soon as they were relieved from their fears at Portsmouth, the English ships were ordered out to observe the French. It appears, from a letter of Lisle's to Paget, that he had been instructed by the king to remain at Spithead.