Napoleon proposed a total of four different strategies between July 1804 and March 1805, each with the object of collecting a large force of ships and moving up the Channel. Common elements included the decoying of some or all of the blockading Royal Navy fleets away from the Channel, the combining of the French fleets to lift the blockade of any ships that remained trapped in port, and the advancing of the fleet up the Channel to Boulogne, where they would escort the invasion force across.
Plan I: July – September 1804 , commander of the French forces that broke out of Toulon Napoleon's first plan, put forward in May 1804 for execution between July and September envisaged the break-out from
Toulon of 10 ships of the line and 11 frigates under Admiral
Latouche Tréville. They would evade the patrolling British fleet under Vice-Admiral
Horatio Nelson and sail into the Atlantic, slipping past
Alexander Cochrane's fleet off
Ferrol and entering the
Bay of Biscay. They would then make for
Rochefort where they would be joined by another six ships of the line. Having evaded Nelson he would collect the from
Cádiz and pass through the
Strait of Gibraltar, after which he would detach two ships carrying 1,800 troops. Nelson immediately rushed his fleet to sea, determining that considering the weather and the fact the French had embarked troops, that Villeneuve was heading east, perhaps to attack locations on the Italian coast, or the islands of Malta or Sardinia, or maybe even Greece or Egypt. He rushed south, hoping to intercept them south of Sardinia, but when they had not appeared by 25 January, he worried that he had missed them, and pressed further east, calling at Greece and then
Alexandria on 7 February. Finding no news of the French, he turned westward, calling at Malta on 19 February, where he received news that the French were back in Toulon. The error of the frigates leaving the fleet unobserved when they had rushed to report to Nelson meant that he had spent nearly six weeks sailing back and forth across the Mediterranean through heavy seas while the French remained in port. A frustrated Nelson returned to resume the blockade. ==Strategic situation in March 1805==