Marching Through Georgia
I don't know. I just don't. It was written well. It kept me interested. The battle scenes were some of the best I've read. But a book that has me choose between cheering on Nazis or cheering on slave-owners? Not something that comes naturally, even when it's clear that the rest of the series probably deals with some changes of heart among the main slaver characters.
Here's the deal, I am not a history buff. I have a vague understanding of what led up to various American or world wars, but that's it. So I don't get that same thrill that I would guess regular readers of the stuff enjoy from the cleverness of manipulating facts and possibilities into a plausible situation. For me to enjoy work like this, I need a few facts filled in for me and I need characters and a story worth caring about. I'd say I got all three here.