On 24 June, French Emperor Napoleon Bonaparte, crossed the Neman River, invading Russia from present-day Poland. Eventually this resulted in disaster for the French.
To intimidate Alexander, Napoleon massed his forces in Poland in the spring of 1812, but still the czar resisted. On June 24, Napoleon ordered his Grande Armée, the largest European military force ever assembled to that date, into Russia.
Which all started when Russian army refused to engage with Napoleon’s Grande Armée of all most 500,000 European troops. Though the Grande Armée did not have enough supplies or the distribution networks required for such a long march. However french strategists assumed the Grande Armée would be supplied by wagons, or would be able to gather supplies as they went. Furthermore, Grande Armée also failed to prepare for Russia’s harsh winter. Its troops were not dressed or trained for the kind of weather they faced.
Besides the invasion lasted six months, and the Grande Armée lost more than 300,000 men during the process. On the other side Russia lost more than 200,000 too. This single battle resulted in more than 70,000 casualties in one day. The invasion of Russia effectively halted Napoleon’s march across Europe, and resulted in his first exile, to the Mediterranean island of Elba.