How did geography affect both napoleon’s invasion and hitler’s invasion of russia?

This historic fact should be read by future leaders who want to conquer Russia: Both Napoleon and Hitler committed severe mistakes for invading Russia during the winter.
Russia is known for having severe, harsh winters, where food sources are scarce and the temperature is way TOO cold.
Geography played a major role in defeating Napoleon and Hitler, because nobody can invade men who are used to living in the winter, the Russians. 

Are their any multiple answer's ?