German metal spikes of the kind known as "Crowsfoot" (German name, "hedgehog") are
reported to have been dropped on motor transport roads, landing fields, and airdromes.
The particular object is made in the shape of a pyramid, each side in the
shape of an equilateral triangle recessed in the center. Each side
is 3 inches long, and the apex of each triangle is sharply pointed
giving 4 spikes in all. The triangle edges are serrated, giving
a "fish-hook" effect, so that once the spike has penetrated a tire it
would be difficult to remove without tearing the cover.
The spike is made from two pieces of thin-gauge steel (1 mm) welded together, the
whole being camouflaged light brown, with olive green stripes. The letters "R" and "L" are
stamped on two of the sides, and may refer to the method of packing. There is a
hole in the center of the pyramid, which presumably takes a holding rod for
packing. (See accompanying sketch.)
A further type has been found of exactly similar construction, but with a base
of only 2 1/2 inches instead of 3 inches.
b. Method of Use
The spike is so designed that, theoretically, whichever way it falls, it
should rest firmly on its base with one point up. It would appear in
practice, however, that when dropped on the ground, there is a good
chance of a point penetrating, thus presenting a flattish surface.
The container in which the spikes are dropped is a thin-gauge, sheet-metal "bomb" painted
dark green and marked with two thin red stripes. The container is 5 feet 6 inches
long, including the fins, has a circumference of 4 feet 10 inches, and is
fitted with lugs which indicate it can be carried externally by the Ju-87, Ju-88, He-111,
and Me-110. Apparently 1,000 to 1,500 spikes can be carried in the container.
A time fuze is fitted so that the spikes are scattered from the air over the road or airfield.