While his third plan was more involved than the others, it had the advantage of calling a greater number of ships into service. Villeneuve was to start from Toulon with eleven ships, release the Spanish squadron of six sail-of-the-line under the command of Admiral Gravina, and one French ship, at Cadiz, and then make for Martinique, where he would find Missiessy’s squadron of five sail. In a similar manner the twenty-one ships of Ganteaume’s fleet at Brest were to rally Gourdon’s fifteen vessels at Ferrol and also proceed to the West Indies. Thus no fewer than fifty-nine sail and many smaller vessels would be congregated for the final effort. While Nelson was searching for them, this immense armament, with Ganteaume in supreme command, would recross the Atlantic, appear off Boulogne, and convoy the flotilla to England. It is unnecessary to give the alternative plans furnished to the admirals. To do so would only tend to involve the broad outline of the manœuvre as detailed above and serve no essential purpose.
Spurred on by Napoleon’s displeasure, Villeneuve put to sea on the night of the 30th March 1805, and was sighted “with all sail set” by two British frigates on the following morning. It was not until the 4th April that Nelson, then off Toro, received this useful if vague intelligence, for the frigate which had followed in the tracks of the Toulon fleet had lost sight of the enemy. Her captain “thinks they either bore away to the eastward or steered S.S.W., as they were going when first seen,” Nelson informs the Admiralty. He “covered the Channel from Barbary to Toro with frigates and the fleet” in the hope of discovering them or obtaining reliable information as to their whereabouts. On the 18th April he says, “I am going out of the Mediterranean after the French fleet. It may be thought that I have protected too well Sardinia, Naples, Sicily, the Morea, and Egypt, from the French; but I feel I have done right, and am therefore easy about any fate which may await me for having missed the French fleet. I have left five frigates, besides the sloops, &c., stationed at Malta for the present service of the Mediterranean, and with the Neapolitan squadron will, of course, be fully able to prevent any force the French have left to convoy troops to Sicily.”