The Russian Campaign of 1812 saw Napoleon lead over 400,000 French and allied troops into Russia to engage the Russian army. The largest battle was the Battle of Borodino in September 1812, which resulted in over 30,000 casualties on each side. After the battle, the Russians evacuated and burned Moscow, forcing Napoleon's army to retreat with no supply lines. During the retreat in the harsh Russian winter, Napoleon's army suffered tremendously from the cold, hunger, and constant harassment by Russian forces. By the time the campaign ended in December 1812, Napoleon had lost over 370,000 men killed or captured, destroying his Grande Armée and marking a turning point in the Napoleonic Wars.