The Heinkel He 111 was the mainstay of the German offensive against Great Britain during the '' Battle of Brittain. It was produced in far larger quantities than the Do-17 sereis and remaind in service throughout the war. The Heinkel He 111 was first displayed in January 1936, not as a bomber but in the guise of a airliner. In 1937 the civil disguise of the He 111 was abandoned; He 111B-1 were sent to the Condor Legion fighting in the Spanish Civil War. The succes of the He-111 in Spain played a large part in shaping German bombing policy, this policy was later proved wrong when the lightly armed bombers sufferd heavy losses over Britain when opposed by modern and determined fighters. The He 111H series was by far the most important variant of the bomber, the H-20 being the first to carry a dorsal gun turret and improved arament together with a redesigned powerful engine

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