What event has a feature that has been described as "the first major military campaign fought entirely by air forces"?
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). It has been described as the first major military campaign fought entirely by air forces.
The Hardest Day The Hardest Day is a name given to a Second World War air battle fought during the Battle of Britain on 18 August 1940 between the German Luftwaffe and British Royal Air Force (RAF). By June 1940, the Allies had been defeated in Western Europe and Scandinavia. Britain rejected overtures for a negotiated peace. Consequently, Adolf Hitler issued the German armed forces ("Wehrmacht") Directive No. 16 ordering the invasion of the United Kingdom.