Factual error: The German tanks are American M47s, post WW2. They had the same hulls as the M46s (also post-WW2), but a better slope and greater effective armor on the turrets.
Factual error: In the scene of the battle on top of the mountain it looks like the Germans have American M116 (75mm) howitzers as part of their weaponry, only visible for a short while.