section_path: Ruler of France/French Empire/War of the Fourth Coalition and Tilsit
section_name: War of the Fourth Coalition and Tilsit
paragraph_text: War of the Fourth Coalition and Tilsit
  
  After Austerlitz, Napoleon increased his political power in Europe. In 1806, he deposed the Bourbon king of Naples and installed his elder brother, Joseph, on the throne. He then made his younger brother, Louis, King of Holland. He also established the Confederation of the Rhine, a collection of German states intended to serve as a buffer zone between France and Central Europe. The creation of the confederation spelled the end of the Holy Roman Empire.
  
  Napoleon's growing influence in Germany threatened the status of Prussia as a great power and in response Frederick William III decided on war with France. Prussia and Russia signed a new military alliance creating the fourth coalition against France. Prussia, however, committed a strategic blunder by declaring war when French troops were still in southern Germany and months before sufficient Russian troops could reach the front.
  
  Napoleon invaded Prussia with 180,000 troops, rapidly marching on the right bank of the River Saale. Upon learning the whereabouts of the Prussian army, the French swung westwards thus cutting the Prussians off from Berlin and the slowly approaching Russians. At the twin battles of Jena and Auerstedt, fought on 14 October, the French convincingly defeated the Prussians and inflicted heavy casualties. With several major commanders dead or incapacitated, the Prussian king proved incapable of effectively commanding the army, which quickly disintegrated.
  
  In the following month, the French captured 140,000 soldiers and over 2,000 cannon. Despite their overwhelming defeat, the Prussians refused to negotiate with the French until the Russians had an opportunity to enter the fight.
  
  Following his triumph, Napoleon imposed the first elements of the Continental System through the Berlin Decree issued in November 1806. The Continental System, which prohibited European nations from trading with Britain, was widely violated throughout his reign.
  
  In the next few months, Napoleon marched against the advancing Russian armies through Poland and fought a bloody stalemate at the Battle of Eylau in February 1807. After a period of rest and consolidation on both sides, the war restarted in June with an initial struggle at Heilsberg that proved indecisive.
  
  On 14 June Napoleon obtained an overwhelming victory over the Russians at the Battle of Friedland, wiping out about 30% of the Russian army. The scale of their defeat convinced the Russians to make peace with the French. The two emperors began peace negotiations on 25 June at the town of Tilsit during a meeting on a raft floating in the middle of the River Niemen which separated the French and Russian troops and their respective spheres of influence.
  
  Napoleon offered Alexander relatively lenient terms—demanding that Russia join the Continental System, withdraw its forces from Wallachia and Moldavia, and hand over the Ionian Islands to France. In contrast, Prussia was treated harshly. It lost half its territory and population and underwent a two-year occupation costing it about 1.4 billion francs. From former Prussian territory, Napoleon created the Kingdom of Westphalia, ruled by his young brother Jérôme, and the Duchy of Warsaw.
  
  Prussia's humiliating treatment at Tilsit caused lasting resentment against France in that country. The treaty was also unpopular in Russia, putting pressure on Alexander to end the alliance with France. Nevertheless, the Treaties of Tilsit gave Napoleon a respite from war and allowed him to return to France, which he had not seen in over 300 days.