In World War II, Operation Pointblank was intended to destroy this.
British homefront morale
Allied naval convoys
The Luftwaffe
The defenses at Odessa
The Luftwaffe. To gain air superiority prior to D-Day, the Allies made the German Air Force its top priority in 1943. The Luftwaffe, forced to attack bomber formations and their escorts hitting airfields and manufacturing, lost the war of attrition.