I found many pieces of this barbed wire in place on top of small hill with remains of
trenches around the top. I also dug here one big and long piece of concrete with casted in that barbed wire with long prats of wire sticking out. I have no idea what it was for.
Is it german barbed wire ? It has square shaped 3mm +- thick wire and distance between the spikes is from 30 to 40 milimeters