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 First French Empire, officially the French Republic, then the French Empire after 1809 and also known as Napoleonic France, was the empire ruled by Napoleon Bonaparte, who established French hegemony over much of continental Europe at the beginning of the 19th century. It lasted from 18 May 1804 to 3 May 1814 and again briefly from 20 March 1815 to 7 July 1815, when Napoleon was exiled to St. Helena.