Rally Cry

Rally Cry - William R. Forstchen An American Civil War unit finds itself transported to a strange new world following a storm in the Bermuda Triangle.

They discover something out of the middle ages, with feudal barons and a zealous church.
Their new ways start to take hold in the population, to the upset of the church, but there is another darker secret no-one tells them about...

Good characters, plenty of action and suspense all the way to the end.