Loyal brother of the Emperor of Austria and at the same time compliant Prince Napoleon of the Rhine Confederation? Ferdinand III. von Toskana shaped his politics effectively within the narrow scope of action of the world war. For Habsburg he used all resources, including the soldiers of Würzburg, who died en masse between Belarus and Portugal. The study of the Grand Duchy of Würzburg shows, using the example of the Prince of the Rhine and second-born of the Habsburg-Lothringers, Ferdinand III. von Toscana (1769-1824), how one could always form militarily less powerful, but still successful, independent politics in the world war of the Sattelzeit and reveals the political mechanisms of war. Wedged between his brother Emperor Franz in Vienna and his Protecteur Napoleon in Paris, Ferdinand III succeeded. Realpolitically adept within his limited action horizon to use the resources available to him not only in Würzburg for himself personally and for the Habsburg-Lothringen dynasty. The investigation follows the "resources" that bled to death on the battlefields of Europe, in every trench and every field battle, also in order to do justice to the demands of modern military history and its perspectives on the history of international relations, social and dynasty history.