After The Downfall
Harry Turtledove’s 2008 After The Downfall is not an alternate history per se. Rather it is an example of the dreaded “isekai” that started with Mark Twain’s A Connecticut Yankee In King Arthur’s Court. A German soldier gets warped from the Battle of Berlin to a fantasy world and then stuff happens. A lot of stuff. A lot of predictable stuff.
This is not one of Turtledove’s better books. Take a ridiculously obvious and unsubtle plot/message, writing that can’t make up for it, and one of the fastest intro-to-sex-scene ratios I’ve ever read. And the “payoff” of that isn’t worth it, trust me.
The best I can say about this is that it’s a sincere attempt at something different and not a series installment stretched out over a long time to get more money. But that doesn’t make the actual book any better.