Photo of German Heinkel He 111 fighter bombers of the Condor Legion (Bomber group K / 88) on the airfield of Lerida, Catalonia, 1939. In the foreground there are grenades. Behind, ground personnel are working. The Saint Andrew’s Cross of the Spanish Air F

Heinkel He-111Bs await their next mission at Lerida, Catalonia. (Sueddeutsche Zeitung Photo/Alamy)