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.
Yes, Gatsby really loves Daisy. He loved her so much that he pretended to be rich, just so she would look his way. When he went to war, he kept all her letters and memories sealed safely in a book. When he found out she was marrying Tom, he sent her a letter with the truth that he was in fact poor, and he let her go because he believed she would have a much better life.
Juliet hides from her parents to talk to Romeo