Question: In September 1939, when the Second World War begun, the then General Alfred Keller commanded the 4th Air Corps during the invasion of which countrty, he commanded Luftflotte 2, with his superior General Albert Kesselring, was a German "Luftwaffe Generalfeldmarschall" during World War II?
Sentence (from "Albert Kesselring"): In a military career that spanned both World Wars, Kesselring became one of Nazi Germany's most skilful commanders, and one of the most highly decorated, being one of 27 soldiers awarded the Knight's Cross of the Iron Cross with Oak Leaves, Swords and Diamonds.
Relevant evidence: No