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French invasion

In the summer of 1812 Napoleon invaded Russia. It was the occupation of Moscow and the desecration of the Kremlin, considered to be the sacred centre of Holy Russia, that changed Alexander's sentiment for Napoleon into passionate hatred. The campaign of 1812 was the turning point for Alexander's life; after the burning of Moscow, he declared that his own soul had found illumination, and that he had realized once and for all the divine revelation to him of his mission as the peacemaker of Europe.

While the Russian army retreated deep into Russia for almost three months, the nobility pressured Alexander to relieve the commander of the Russian army, Field Marshal Barclay de Tolly. Alexander complied and appointed Prince Mikhail Kutuzov to take over command of the army. On 7 September, the Grande Armée faced the Russian army at a small village called Borodino, 110 kilometres (70 mi) west of Moscow. The battle that followed was the largest and bloodiest single-day action of the Napoleonic Wars, involving more than 250,000 soldiers and resulting in 70,000 casualties. The outcome of the battle was inconclusive. The Russian army, undefeated in spite of heavy losses, was able to withdraw the following day, leaving the French without the decisive victory Napoleon sought.

A week later, Napoleon entered Moscow, but there was no delegation to meet the Emperor. The Russians had evacuated the city, and the city's governor, Count Fyodor Rostopchin, ordered several strategic points in Moscow to be set ablaze. The loss of Moscow did not compel Alexander to sue for peace. After staying in the city for a month, Napoleon moved his army out southwest toward Kaluga, where Kutuzov was encamped with the Russian army. The French advance toward Kaluga was checked by the Russian army, and Napoleon was forced to retreat to the areas already devastated by the invasion. In the weeks that followed the Grande Armée starved and suffered from the onset of the Russian Winter. Lack of food and fodder for the horses and persistent attacks upon isolated troops from Russian peasants and Cossacks led to great losses. When the remnants of the French army eventually crossed the Berezina river in November, only 27,000 soldiers remained; the Grande Armée had lost some 380,000 men dead and 100,000 captured. Following the crossing of the Berezina, Napoleon left the army and returned to Paris to protect his position as Emperor and to raise more forces to resist the advancing Russians. The campaign ended on 14 December 1812, with the last French troops finally leaving Russian soil.

The campaign was a turning point in the Napoleonic Wars. Napoleon's reputation was severely shaken, and French hegemony in Europe was weakened. The Grande Armée, made up of French and allied forces, was reduced to a fraction of its initial strength. These events triggered a major shift in European politics. France's ally Prussia, soon followed by Austria, broke their imposed alliance with Napoleon and switched sides, triggering the War of the Sixth Coalition.