German Airborne Invasion of Crete
In the Second World War, Italy invaded Greece but struggled terribly. While in a way Greece was a distraction for Germany, in another way it needed to be secure their flank for when the invaded the Soviet Union.
Part of the war for Greece was the airborne invasion of Crete. The Greeks and British fought bravely but to no avail. This was a glimpse of the value of the airborne forces.