Earth's Last Citadel

Four WWII combatants travel to a distant and dangerous future in this novel by “two of the most revered names from [science fiction’s] Golden Age” (SFReviews.net).
 
During World War II, four bitter enemies are pulled forward a billion years in time by a master being from an alien galaxy. They arrive on a dying Earth—to Carcasilla, Earth’s last citadel—where the mutated remnants of humanity are ma...