The Lost Regiment: Rally Cry
On their way to fight in still another battle of the War Between the States, Union Army Col Andrew Keane and his men board a transport ship with several other passengers. They're "diverted" by a space/time warp to either an Earth of a different timeline or a very Earth-like planet where humans are bred as food for an alien race of beings.
Actually, I never quite decided who were the aliens, the "aliens" or the humans since neither may have originat...