A French monument to six French partisans who returned by parachute and lost their lives on May 9, 1944.
I'm unfamiliar with this incident, but a large percentage of these operations were unsuccessful due to the penetration of the British SOE by the Germans. The SOE was only one of several British secret service organizations during the war and was not a full time professional one. Following the war it investigated the penetration and somewhat, but not fully, determined what had occurred, although it also operated to cover up the event as well.
This monument indicates that the captured Frenchmen were deported to Germany where they must have been subsequently executed at some point.