the War of the Third Coalition, Napoleon dictated the Treaty of Pressburg which included the formal dissolution of the Holy Roman Empire and the abdication of Emperor Francis II from the nominal reign over it. Napoleon established instead a German client state of France known as the Confederation of the Rhine which, inter alia, provided for the mediatization of over a hundred petty princes and counts and the absorption of their territories, as well as those of hundreds of imperial knights, by the Confederation's member-states. Several states were promoted to kingdoms such as the Kingdom of Bavaria, the Kingdom of Saxony or the Kingdom of Hanover. Following the formal secession from the Empire of the majority of its constituent states, the Emperor dissolved the Holy Roman Empire. Rise of German nationalism under Napoleon Under the hegemony of the French Empire (1804–1814), popular German nationalism thrived in the reorganized German states. Due in part to the shared experience, albeit under French dominance, various justifications emerged to identify "Germany" as a potential future single state. For the German philosopher Johann Gottlieb Fichte, The first, original, and truly natural boundaries of states are beyond doubt their internal boundaries. Those who speak the same language are joined to each other by a multitude of invisible bonds by nature herself, long before any human art begins; they understand each other and have the power of continuing to make themselves understood more and more clearly; they belong together and are by nature one and an inseparable whole. A common language may have been seen to serve as the basis of a nation, but as contemporary historians of 19th-century Germany noted, it took more than linguistic similarity to unify these several hundred polities. The experience of German-speaking Central Europe during the years of French hegemony contributed to a sense of common cause to remove the French invaders and reassert control over their own lands. The Napoleon's campaigns in Poland (1806–07) resulting in his decision to re-establish a form of Polish statehood (the Duchy of Warsaw) at the cost of also Prussian-conquered Polish territories, as well as his campaigns on Iberian Peninsula, in western Germany, and his disastrous invasion of Russia in 1812 disillusioned many Germans, princes and peasants alike. Napoleon's Continental System nearly ruined the Central European economy. The invasion of Russia included nearly 125,000 troops from German lands, and the loss of that army encouraged many