The Battle of Austerlitz, also known as the Battle of the Three Emperors, was one of the most important military engagements of the Napoleonic Wars. The battle occurred near the town of Austerlitz in the Austrian Empire. Around 158,000 troops were involved, of which around 24,000 were killed or wounded. The battle is often cited by military historians as one of Napoleon's tactical masterpieces, in the same league as other historic engagements like Cannae or Gaugamela. The military victory of Napoleon's Grande Armée at Austerlitz brought the War of the Third Coalition to an end, with the Peace of Pressburg signed by the French and Austrians later in the month. These achievements did not establish a lasting peace on the continent. Austerlitz had driven neither Russia nor Britain, whose armies protected Sicily from a French invasion, to settle. Prussian resistance to the growing power of French military invasions in Central Europe led to the War of the Fourth Coalition in 1806.

The War of the Fourth Coalition was a war spanning 1806–1807 that saw a multinational coalition fight against Napoleon's French Empire, subsequently being defeated. The main coalition partners were Prussia and Russia with Saxony, Sweden, and Great Britain also contributing. Excluding Prussia, some members of the coalition had previously been fighting France as part of the Third Coalition, and there was no intervening period of general peace. On 9 October 1806, Prussia declared war on France and joined a renewed coalition, fearing the rise in French power after the defeat of Austria and establishment of the French-sponsored Confederation of the Rhine in addition to having learned of French plans to cede Prussian-desired Hanover to Britain in exchange for peace. Prussia and Russia mobilized for a fresh campaign with France, massing troops in Saxony.