From World War II, it was yet another beach obstacle in The Atlantic Wall that the Germans had placed in the English Channel to prevent Allied forces from effectively landing boats too close to the shore.

This beach obstacle was approximately nine to ten feet high. and was placed further out into the English Channel than the Czech Hedgehogs.

There are two ways a log ramp was made, but both consisted of three logs

The first design consisted of two logs standing straight up, with one being longer than the other, while a third log was placed on top of the two logs created a slope. A mine was also placed at the top of the sloping log. Look at the example below.

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Of course the slope of the log was not that steep.

Another way the log ramps were built were two short logs were placed in an upside down V with a longer sloped log attached at the point of the V

The desired effect of the log ramp was so any Allied landing craft that got caught in the obstacle would obviously ride up the slope of the log and upon reaching the mine at the top of the slope, would detonate the mine and the ship itself.

second example of log ramp provided by picture at this url

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