As part of Nazi Germany’s support for the Nationalist forces in the Spanish Civil War, an air component of volunteer crews was established as the Legion Condor. Initial Legion Condor bomber strength was composed of Junkers Ju 52. However these proved vulnerable to Republican Polikarpov I-16 fighters. In response, Germany sent some of its latest bombers to provide a more effective attacking force. This consisted of four Dornier Do 17s, four Junkers Ju 86s and four Heinkel He 111Bs.
The He 111s combat debut was on 9 March 1937 and by October, deliveries of new machines enabled the whole of Kampfgruppe 88 to be equipped with them. As the newer He 111E model became available, B models were passed on to the Spanish Nationalist Air Force, who used them to equip Grupo 10-G-25 in August 1938.
During the Spanish Civel War, the Legion Condor received a total of 94 Heinkel He 111s. Of these 21 were lost to enemy action, 15 to accidents and one more to sabotage. The remaining 25 He 111B and 33 He 111Es were left to the new Spanish Air Force at the end of the war.
Late in 1939 Spain received three He 111Js and three He 111Hs which were used for weather reconnaissance. An additional H model was received as a pattern aircraft for the license production by CASA. CASA built 256 H-16 bombers as the CASA 2.111.
He 111B models continued operating as bombers until 1952, with the E models being retired in 1956. They continued to be used as trainers until 1958 when the last one was retired. Although mostly retired during the 1960s, some CASA 2.111s continued as transports into the early 1970s.