From what I have read the need to deal with the bocage/headgerows was a unique problem to the Normandy break out and was a concern primarily to US tank units as most Commonwealth tank units where in more open country. Basically every units motor pool had to come up with some rigging quickly most of the time they made use of the German steel beach defenses and just welded them to the hull.
As I understand there is a bit of a myth that some un named American solider came up with the most effect design if the person remains unnamed that usually means that he does not really nor ever existed.The bocage busters where really an example of the quick thinking of many people to solve the same problem.
What happened was the ones that worked got copied by neighboring units that either had not yet come up with a design or had come up with a poor one and therefore copied the better example.
One unsuccessful design was supposed to punch holes into the earth under the hedge and then a sapper was supposed to come in and place explosives into the holes created by the implement apparently it failed because it took too much explosives to blow the hedge away not to mention that the poor sapper was exposed to every defending small arm just 10 or 15 feet away from him.
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