The Battle of Borodino, fought in 1812, marked a pivotal moment in Napoleon's downfall. This fierce battle occurred during the French invasion of Russia and was one of the bloodiest single-day engagements in history. Although it resulted in a costly victory for Napoleon, the heavy casualties and the lack of a decisive win for his forces weakened his campaign. The Russian army’s strategic retreat and scorched-earth tactics further undermined the French position. The battle exemplified the difficulties Napoleon faced in adapting to the harsh Russian environment and foreshadowed the disastrous retreat of his Grand Army, contributing to his eventual defeat.