 Complete the following phrase:  Many innovative, and often lethal, aeronautical bombing techniques were tested by Germanys Condor Legion forces on Spanish soil against the areas that remained loyal to the Republican Government with the permission of Generalísimo Franco. Nazi help to the Nationalist Air Force was part of Hitlers German re-armament strategy and the techniques that German Nazi pilots learned in Spain would later be used in World War II. Despite the devastation and the human casualties caused by the bombing of the Basque city of Guernica in 1937, known by the Luftwaffe as 