The wind suddenly howled round the signal station tower for a moment, threatening to dislodge Napoleon’s hat, and his hand flew up to hold the brim firmly until the gust had passed. He waited a moment to be sure, then raised his telescope and rested it on the edge of the wall that ran round the top of the tower. He slowly tracked across the choppy white-capped waves out over the sea until he found what he was looking for.

A British frigate was cruising along the coast in a languid fashion, under topsails in the strong breeze. A handful of tiny figures could be seen climbing the rigging to make adjustments to the trim of the canvas that bloomed from the highest spars. Napoleon watched the warship for a moment, as it gracefully went about and put in a tack away from the coast.The same ship had been patrolling the approaches to the harbour for months, in an unceasing routine that varied only minutely according to weather conditions. Napoleon shifted the direction of the telescope towards the horizon and after a short search found the neatly spaced line of white topsails of the rest of the blockading squadron.At least ten ships of the line stood watch over the French port, great towering slabs of oak pierced by two or three lines of gun ports. Between them those ships carried twice as many cannon as the army surrounding Napoleon, and of greater weight too. As the situation stood, if the invasion fleet attempted to cross the Channel in the face of the British navy it would be blown to pieces long before it reached the English coast.

The situation was about to change, Napoleon reflected with satisfaction as he straightened up and closed his telescope with a snap. For months now the scattered squadrons of the French navy had been breaking out of their ports and heading across the Atlantic to a secret rendezvous off the coast of Martinique. If all went according to plan, AdmiralVilleneuve would wait until he had forty ships of the line under his command. Then he would recross the ocean and fall upon the English Channel fleet with overwhelming force, and crush the enemy. Even if he failed to defeat them,Villeneuve would be able to clear the Channel for long enough to cover the invasion fleet.

Napoleon turned to his chief of staff. ‘Still no word then, Berthier?’

‘No, sire. Nothing in the morning despatches.’

‘No signals from Paris? Nothing relayed from the watch station at Ushant?’

‘I’m afraid not, sire.’