So, just today, I happened to be back in the same area, and took a stroll through the woods 'round there.
But, the path I had been followed suddenly ended, so I just kept walking in the same general direction, as there appeared to be a road a bit further on.
As you can see on the picture, there were some signs put up there, I approached them from their blind side.
So, I got to that road, turn round and got to read them signs...
Thanks very much for not putting up them signs on the other side of the wooded area, the part where I entered it...
In short: There used to be a German Ammo depot in the woods there.
There's been some efforts after the war to clean it all up, but the area is not clean yet... So one is advised to stay on the paths ... and not venture off them.
Oh well, I saw nothing, heard nothing, and could continue my walk just fine...
Darn, that would be so nasty, getting killed by WWII some seventy years later