Before the battle ended, the naval force of France, and with it Napoleon's projects of invasion, were utterly and hopelessly ruined. Eighteen prizes were taken, and, though many of these were lost in a gale, four ships which escaped were afterwards captured, and the remainder lay for the most part shattered hulks at Cadiz. By this battle the supremacy of Great Britain at sea was finally established. Nelson, who, during the ship-to-ship engagement which followed his penetration of the enemy's line, was mortally wounded by a sharp-shooter from the mizzen-top of the _Redoutable_, died before the battle was over, though he was spared to hear that a complete victory was secure. His death is among the heroic incidents of history, and his last achievement, both in its conception and its results, was the fitting climax of his fame. The plan for the battle which he drew up beforehand for the instruction of his captains, and the changes which he made in it to meet the conditions of the moment are alike worthy of his supreme genius as a naval tactician. His arrangements were carried out by men who had learned to love and trust him, and who were inspired by the fire of his spirit, and hence it was that the allied fleet of France and Spain perished at the "Nelson touch".[29] Very different were the fortunes of war in central Europe, where Napoleon himself commanded the "army of England". It was not until the end of August that Napoleon knew that Villeneuve would be unable to appear in the Channel, but no sooner did he abandon his project of invasion in despair than he resolved on a campaign scarcely less arduous, and gave orders for a grand march into Germany. Pitt, as we have seen, had successfully negotiated an alliance with Russia and Austria, whose armies were converging upon the plains of Bavaria and were to have been reinforced by a large Prussian contingent. Unhappily, they had not effected a junction when Napoleon crossed the Rhine near Strassburg and the Danube near Donauwörth, while he detached large forces to check the advance of the Russians and the approach of reinforcements expected from Italy. One of these movements involved an open violation of Prussian territory, but he could rely on the well-tried servility of Frederick William. The first decisive result of his strategy was the surrender of Mack at Ulm, with 30,000 men and 60 pieces of ordnance. This event took place on October 20, the very day before the battle of Trafalgar, and opened the road to Vienna, which the French troops entered on November 13, occupying the great bridge by a ruse more skilful than honourable, during the negotiation of an armistice. Vienna was spared, while Napoleon pressed on to meet the remainder of the Austrian army, which had now been joined by a larger body of Russians near Brünn. The allies numbered about 100,000 men; Napoleon's army was numerically somewhat less, but possessed the same kind of superiority as the British navy at Trafalgar.