Answer:
36
Explanation:
What you need to do is cut the height in half because half is left in the box.
6/2=3
The formula will now look like 3x4x3
If you multiply it, you get 36.
Actually, there is a lot of pitfalls in the credibility in this argument. There are a lot of websites in the Internet with information about the so called French Invasion that occurred on the 24th of june, 1812.
The French Invasion is also known in Russia as The Patriotic War of 1812 and in France is known as the Russian Campaign. Try to search under these alternative names and you might find more information.