Yeah! As far as hedgehogs go- they were much better off in urban warfare as opposed to the beachheads. Here's a quote from the wiki page (see "
Czech hedgehog")
"Czech hedgehogs were widely used during World War II by the Soviet Union in anti-tank defense. They were produced from any sturdy piece of metal and sometimes even wood, including railroad ties. Czech hedgehogs were especially effective in urban combat, where a single hedgehog could block an entire street."
I've always thought they looked more at home in an urban environment anyway.
Tetrahydras on the other hand? Not so sure... never seen one prior to Huxy's post, they look like they'd be hard to do on the fly in an urban environment (some I-beam rubble and a welding torch vs a concrete mold?- you know what I mean?) but that's just a guess...