maciejm Feb 25, 2011:

http://www.gimnazjumbodzanow.pl/wydarzenia07_08/wystawa/fot4... To moim zdaniem wyjaśnia sprawę.

JPG Feb 24, 2011:

http://www.gimnazjumbodzanow.pl/wydarzenia07_08/wystawa/fot4...

oraz to:

http://www.gimnazjumbodzanow.pl/tablica_pamiatkowa.htm

Andrzej Mierzejewski Feb 24, 2011:

A second thought: fabricating caltrops from nails should have been no problem to a blacksmith in WW2 time. Still, we do not know how the koziołek looks.

Andrzej Mierzejewski Feb 24, 2011:

Rght, I mean caltrop http://french.alibaba.com/product-free/tire-spikes-caltrop-c...
I saw such or similar devices in movies. No idea if they really were used in WW2. Jerry, is there any image?

Adrian Liszewski Feb 24, 2011:

Andrzej, what you describe is a caltrop: http://en.wikipedia.org/wiki/Caltrop . I suppose the item described in the question is one solid object that you put across the road, for instance spike strip: http://en.wikipedia.org/wiki/Spike_strip . I just cannot imagine how those were used in WW2. All the movies etc. showed only a wooden barriers, wrapped with barbed wire.

Andrzej Mierzejewski Feb 24, 2011:

AFAIK such device is a three-dimensional 'star' with four equal arms. No matter how it fell down on the road, one arm is always pointed up.