 Richthofen, who served as chief of staff to Hugo Sperrle in the Condor Legion, had already solved many of these issues and his operations in Spain, influenced the plans for the attack on Poland in 1939.Jeschonnek was especially impressed by the effect the Luftwaffe had on ground operations in Spain.He understood ground-support would be achieved primarily through aerial interdiction, but diverted vast resources to the close air support mission.