It can be done! What I used: the Amazon Kindle application for the iPhone, and a free download (also from Amazon) of Tolstoy's War and Peace. It helped─somewhat─that I'd read the book previously. (There are parts that you can basically skip.) Yes, there were some problems with the translation. Quite a lot of phrases are in French, with no translation offered, requiring one to guess at the meaning from the context. And somehow Andrei and Maria have become Andrew and Mary. (Doesn't seem right.)
Needless to say, you only get around one or two paragraphs per screen. Tapping the right side of the screen brings you to the next "page."
But the basic story is easy enough to follow. (Spoiler alert: Napolean's army is destroyed by the Russian winter in 1812.)