Why did Napoleon fall in Russia? In the final analysis, it was the long battle line that led to the difficulty of supply, and in the end, Napoleon's 600,000 troops were only about 20,000 troops when they withdrew from Russia.
When Napoleon's army attacked Russia, it was overwhelming and rapidly pushed into the interior of Russia, but at the same time, the French supply line was getting longer and longer, and the difficulty of obtaining supplies was also increasing. However, Russia resolutely carried out the clearing of the wall and burned the farmland, villages, etc. that were about to be acquired by the French army, and the French army could not get anything, and could only continue to rely on supplies from thousands of miles away. In the 19th century, transportation technology, etc. was still relatively old, land transportation was extremely dependent on horse-drawn carriages, etc., the speed was slow and too small, and there were sporadic Russian raids along the way, and it was very difficult to supply.
As a result, the French army was in a disadvantageous situation, and the war had to be resolved as soon as possible, and if it was delayed, it would fail. After the Battle of Borodino, the Tsar abandoned Moscow directly and ran to Petrograd with his high-ranking officials to choose to continue to resist, which the French army could not reach. Although Napoleon acquired Moscow, such an empty city had no value, and the ensuing fire reduced it to ruins.
At this time, winter in Russia was approaching, the Tsar would never choose to compromise with Napoleon, and the supply of the French army was already extremely difficult. Therefore, in the case of no hope of continuing to fight, Napoleon could only choose to withdraw his troops. After entering the winter, the french army that lacked clothing and food was very seriously reduced, coupled with the continuous pursuit of the Russian army, the French army suffered heavy casualties, and finally after crossing the Neman River, Napoleon only had 20,000 troops left, and the expedition to Russia finally became a complete failure.