Some 600,000 soldiers from across Europe clashed at Leipzig in what became known as the Battle of Nations. Napoleon, facing a coalition of Russian, Prussian, Austrian, and Swedish forces, was decisively defeated and began withdrawing on October 19th, with the retreat continuing into the 20th as coalition armies consolidated their victory and pursued the shattered Grande Armée westward.
The scale was almost incomprehensible for its era: roughly 600,000 combatants converged on the Saxon city of Leipzig, making it the largest battle fought in Europe prior to the First World War. Napoleon commanded around 225,000 men against a coalition force of Russians, Prussians, Austrians, and Swedes numbering over 350,000, and after four brutal days of fighting the outnumbered French were forced into a chaotic retreat.
The most infamous moment came when a nervous engineer detonated the only bridge across the Elster River too early, trapping thousands of French soldiers—including Marshal Poniatowski, who drowned trying to escape—on the wrong bank as coalition forces closed in. By October 20th, the scattered remnants of the Grande Armée were streaming westward, and the myth of Napoleonic invincibility in Germany had effectively ended. Within months, the coalition would be marching on Paris itself.
Key people: Napoleon Bonaparte, Prince Karl von Schwarzenberg, Józef Poniatowski