Perhaps the only factual scene in the movie. On 24 December, Kampfgruppe Peiper abandoned their vehicles in the forest near La Gleize and the 800 survivors walked back to German lines near Stavelot. The Spanish countryside that was used for the film might have worked pretty well for Rat Patrol. Bad, bad movie.
Of course that was just one German element and the ground lost wasn’t retaken for a month. Bad movie at every level.