Following the rejection of his Continental System by Czar Alexander I, French Emperor Napoleon orders his Grande Armee, the largest European military force ever assembled to that date, into Russia. The enormous army, featuring some 500,000 soldiers and staff, included troops from all the European countries under the sway of the French Empire.
During the opening months of the invasion, Napoleon was forced to contend with a bitter Russian army in perpetual retreat. Refusing to engage Napoleon's superior army in a full-scale confrontation, the Russians under General Mikhail Kutuzov burned everything behind them as they retreated deeper and deeper into Russia. On September 7, the indecisive Battle of Borodino was fought, in which both sides suffered terrible losses. On September 14, Napoleon arrived in Moscow intending to find supplies but instead found almost the entire population evacuated, and the Russian army retreated again. Early the next morning, fires broke across the city, set by Russian patriots, and the Grande Armee's winter quarters were destroyed. After waiting a month for a surrender that never came, Napoleon, faced with the onset of the Russian winter, was forced to order his starving army out of Moscow.
During the disastrous retreat, Napoleon's army suffered continual harassment from a suddenly aggressive and merciless Russian army. Stalked by hunger and the deadly lances of the Cossacks, the decimated army reached the Berezina River late in November, but found their way blocked by the Russians. On November 27, Napoleon forced a way across at Studenka, and when the bulk of his army passed the river two days later, he was forced to burn his makeshift bridges behind him, stranding some 10,000 stragglers on the other side. From there, the retreat became a rout, and on December 8 Napoleon left what remained of his army to return to Paris. Six days later, the Grande Armee finally escaped Russia, having suffered a loss of more than 400,000 men during the disastrous invasion.