Normandy hedgerows
I’ve read that the hedgerows were a nasty surprise- in aerial photographs, they showed up simply as boundaries between fields. They turned out to be tall hard packed berms, built up over generations by farmers clearing and improving their fields. This gave enemy defenders excellent cover and concealment, as well as making attacking troops visible and vulnerable when attacking over them.
As usual, when turned loose and allowed to innovate, the US Army adapted and overcame. One solution was the “Rhino” tank- a standard Sherman tank, with a long pipe “spike” welded to the nose-this allowed the tank to pierce, then knock down hedgerows for a more direct attack (or to destroy an enemy position).
I’m a bit of a WWII buff- not too serious about it, but it’s always interesting- and there’s always more to learn about it.