Hi Adriano,
The source is the
Luftwaffe Lagebericht for 15 March and the night of 15/16 March 1941. I checked ULTRA and could find nothing there about the attack. As for the translation, the anti-aircraft guns put up lively fire, but there was no recognizable success.
A little more on the attack, also from the
Lagebericht: "
00.50-01.30 Vannes, 35 Sprb., Abwurf auf den Platzrand des Flugplatzes. 10 Soldaten (Infanteristen) tot, 7 schwer verletzt. 1 Baracke in Brand geraten. Ausserdem wurde 1 S.-Anlage mit mehreren Sprengbomben angegriffen."
Cheers,
Andrew A.
Air War Publications -
www.airwarpublications.com/earticles