The Battle of the Ebro was the longest and largest battle of the Spanish Civil War. It took place between July and November 1938, with fighting mainly concentrated in two areas on the lower course of the Ebro River, the Terra Alta comarca of Catalonia, and the Auts area close to Fayón in the lower Matarranya, Eastern Lower Aragon. These sparsely populated areas saw the largest array of armies in the war. The battle was disastrous for the Second Spanish Republic, with tens of thousands left dead or wounded and little effect on the advance of the Nationalists.
The key to the battle was Nationalist air superiority, provided by the Italian Aviazione Legionaria and German Condor Legion squadrons that flew under the Aviación Nacional markings. Some 500 first class planes were available on the Nationalist side against only some 35 modern fighters and some 40 second class aircraft of the Spanish Republican Air Force. In July, the Legion Condor had destroyed 76 Republican planes and by August the Republican Air Force had lost air superiority in the area. The Republican planes were outnumbered by at least two to one and most of the experienced Soviet pilots had been withdrawn. Republican anti-aircraft defenses proved to be inadequate and many planes were destroyed on ground.
The pilot of the Bf109D-1 of the 3/J88 Legion Condor was Oblt Werner Mölders 6+79. He was a World War II German Luftwaffe pilot, wing commander, and the leading German fighter ace in the Spanish Civil War. He became the first pilot in aviation history to claim 100 aerial victories and was highly decorated for his achievements. Mölders was instrumental in the development of new fighter tactics that led to the finger-four formation. He died in an air crash in which he was a passenger.
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