The Conference of Dresden began, an attempt by Napoleon to secure support for his planned invasion of Russia.

The Conference of Dresden was a May 1812 gathering of European leaders arranged by Napoleon I of France as part of his preparations for the invasion of Russia. It was intended as a demonstration of his power and to seek military assistance for his campaign and began upon Napoleon's arrival in the Saxon capital on 16 May. Attendees included at least one emperor, six kings and numerous princes, grand duke, dukes and field marshals. Elaborate banquets, concerts and theatrical performances were laid on at the expense of the French state though Napoleon was largely pre-occupied with final planning for the invasion. Whilst at the conference Napoleon sent General Narbonne to meet with Alexander I of Russia with his final ultimatum. Alexander refused to make the territorial concessions demanded and stated that he would prefer to fight rather than agree to a "disgraceful peace". On 29 May, the day after receiving Alexander's reply, Napoleon left Dresden to lead the Grande Armée into Russia. The conference has been cited as a factor in the United States' commencement of the War of 1812 against Britain and the first indication of Napoleon's desire to wage war upon Russia since the signing of the 1807 Treaties of Tilsit.