War of the Fourth Coalition

The War of the Fourth Coalition was fought in 1806 and 1807 between Napoleon's French Empire and a renewed coalition led by Prussia and Russia, with Saxony, Sweden and Great Britain also taking part. Prussia entered on 9 October 1806, alarmed by French power after Austria's defeat and the creation of the Confederation of the Rhine. Napoleon destroyed the Prussian army in a fast campaign that culminated at Jena and Auerstedt on 14 October 1806, then took Berlin and pushed on into East Prussia and Poland. He fought the Russians to an inconclusive result at Eylau in February 1807 and beat them decisively at Friedland on 14 June 1807. The Treaties of Tilsit that July ended the fighting on the continent, stripped Prussia of much territory and gave France new client states in Westphalia and the Duchy of Warsaw. Britain stayed at war with France. The sources give casualties by side rather than a single toll, and one reports 28,000 killed among France and its allies.