Hi Gregoire,
Thanks for reacting ! No doubts about the fact that it was a pusher (Voisin ? Farman ?). The date is not 100 % certain. I found this in the Kriegstagesbuch of a veterianarian, Wilhelm Rieck, and I even saw a picture of the plane.
I remember there was even some kind of an S in a circle on the rudder. The underground was a bright color. It might have happened earlier, but most certainly after the 9th. The statement in his diary is somehow a bit unclear. It sounds a bit as if it just happened in the morning and that he goes to take a look at it in the afternoon. But it can also be interpretaded otherwise.
Best from Regulus