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"In the summer of 1940, III. / JG 26 Major Adolf Galland leader based at the airfield Caffiers located east of Calais and from there they used to make incursions into British airspace. An engineer officer of III. / JG 26 which was Schödter Rolf Hauptmann is a photography enthusiast, and he took lots of color photos of the unit, some of which is the photo above and the photos afterwards. This photo shows the Bf 109 E-4 "Weiß 13", flown by Leutnant Walter Blume of 7.Staffel. Parts of the engine cover has been removed, while the former looks at the closing hole shot machine guns that have been placed on the ground. This indicates that the aircraft is exposed to damage in battle, and a technician is seen to record how severe the damage is.
Hello! Just for general information these pictures we not taken in Caffiers (but Caffiers was indeed the home base of this aircraft). "Luftwaffe im Focus" magazine got it wrong here. The airfield is actually Calais-Marck, and it could be that the Klemm in the background was used by the technical officer to commute from Caffiers to attend to the damaged Lt Blume aircraft as its pilot could not do it that far?...
The hangar we see in the photo is a typical pre-war French hangar of which one example existed in Calais (as well as in Dunkerque Mardyck). Caffiers was not an airfield before the German take over (and for good reason: you should see the place! There was only one possible safe landing direction, in Caffiers...), and had a typical German pre-built "Werkhalle" installed in 1940.
Indeed Calais was enormously easier and safer to use in an emergency than Caffiers...