PreparationWhen Villeneuve decided to sail from Cadiz his plan was for Magon to sail out with his squadron first and capture or drive off the British frigates. On October 19th and a fair wind for leaving Cadiz blowing Villenueve hoisted the order for ships to sail, There was some confusion amongst the fleets captains over whether this order was just for Magon to sail, the frigates or the whole fleet. As the fleet set sail the breeze died away and only seven battle ships and three frigates made it out of the harbour. The wind was too light to let them chase off the British frigates. Villeneuve was forced to order the rest of the fleet to anchor for the night.
The British frigate Sirius made the signal 370, 'Enemy's ships are coming out of port', which was repeated along the chain of ships until it reached the main fleet. Nelson then signaled the fleet for 'general chase south-east', his plan was to steer for the Straits of Gibraltar and prevent the Combined Fleet from sailing into the Mediterranean.
On October 20th the rest of the Combined Fleet got under sail and set course for the south-east. Because Nelson had reacted quickly to the signal 370, the British fleet reached the entrance to the Strait before the French and Spanish fleet had left Cadiz. So the British fleet retraced its steps back to the north-west.
As the British Fleet had waited for the Combined Fleet to sail from Cadiz Nelson had asked his captains to come on board the Victory and had explained his plan of attack. The ships were to form two columns, with Nelson in command of one and Collingwood the other, and sail at the centre and rear of the enemy line of battle so as to bring the British ships into close action and cut off the van of the Combined Fleet, which would then take time to get back into the action. Nelson wrote a detailed memorandum explaining his plan on the 9th October, although this was not stricly adheared to in the battle. Nelson reported that his captains were pleased with this innovative plan.
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