I remember reading where the ex-SS types were quite effective. When the road was mined, they'd just head into the closest village and grab a bunch of locals to strap on the lead vehicles. Someone always seemed to "remember" where the mines were.
They quickly learned that this only worked when they used locals; the dinks at the next village didn't give a hoot about the ones from the last village.
I wish I remember the name of the book. It was great.