Lets say that Manstein commanded Army Group South during Operation Barbarossa. As many of you know, AGS was the slowest of the three army groups to advance not only because they faced better opposition but because AGS was tasked in conquering Ukraine, which is a large country, thus dispersing their forces. How do you think they would have fared especially in the first week of the war during Brody-Dubno-Rovno Battles?
However, you can put them in any situation, like Stalingrad, Moscow or Kursk.