This aircraft was one of three designs of twin engined light bombers to be seen over the skies of Britain during the Battle. It had been designed in the mid-Thirties, initially as a commercial aircraft carrying a few passengers. Not achieving much success in that role, it was taken over by the Luftwaffe as a potential light bomber and saw service during the Spanish Civil war. In this role, it was to have a fair success.
The feature of this aircraft was its long, rather slim fuselage, which led it to be dubbed a flying pencil. Equipped with 4 to 8 machine guns, it was especially good at accurate low-level attacks. The usual bomb load of the Do17 was some half dozen 250 kg bombs.
The aircraft did much damage that summer to Britain, particularly hitting the airfields of 11 Group.