Crimzon,
Thank you for the kind words. We're glad you enjoyed the site.
Regarding the "1812 Overture," one need only listen to a few bars of both "La Marseillaise" and "God Save The Czar" to understand Tchaikovsky's nationalist motifs.
"La Marseillaise" represents Napoleon's invading French army:
http://www.youtube.com/watch?v=4K1q9Ntcr5g#t=0m30s"God Save The Czar" represents the ultimately victorious Russian forces:
http://www.youtube.com/watch?v=zWY-9UihgYgWe're happy to make it clear that "God Save The Czar" was the Russian national anthem at the time... of Tchaikovsky's composition.
"God Save The Czar" became Russia's anthem in 1833. Tchaikovsky was born in 1840. He composed the overture in 1880. Since "God Save The Czar" was the Russian anthem for the whole of Tchaikovsky's life, we imagine he felt the tune was entirely appropriate to represent Russia.
Interestingly enough, "La Marseillaise," the French national anthem since 1795, was banned by Napoleon in 1805, so it wouldn't have been heard during the time of the battle either! But it was reinstated in 1879, the year before Tchaikovsky composed his overture.
You are correct that "God Preserve Thy People" (a Russian Orthodox Troparion of the Holy Cross) is used a couple of times in the 1812 Overture, but it is "God Save The Czar" that represents opposing forces.
And yes, while the Soviets were in power they altered Tchaikovsky's music, substituting other patriotic melodies for "God Save The Tsar." So everybody involved is guilty of a little revisionist history :)