Early Napoleonic Wars By EmmanuSabo 1805 First Alliance: Britain, Austria and Rusia Oct 25, 1805 1805, Nelson wiped out the French fleet at the Battle of Trafalgar. Dec 2, 1805 Napoleon defeat the Austrians and Russians at the Battle of Austerlitz. 1806 The French Army soundly defeated the Prussians at the battles of Jena and Auerstadt. 1806 Continental System was first announced by the Berlin Decree 1807 France and Russia signed the Treaty of Tilsit and allied against the British Jun 14, 1807 Napoleon next sent his forces against the Russian Army of Czar Alexander I