Question: What event has a feature that has been described as "the first major military campaign fought entirely by air forces"?
Sentence (from "Battle of Britain"): The Battle of Britain (German: "Luftschlacht um England" , literally "the air battle for England") was a military campaign of the Second World War, in which the Royal Air Force (RAF) defended the United Kingdom (UK) against large-scale attacks by the German Air Force (Luftwaffe).
Relevant evidence: No