Daddy said that during the war, they would sometimes hear German soldiers howling like wolves. He said they were pretending to be werewolves.
The Americans knew what they were doing and basically just thought it was interesting.
Their die hard guerilla warfare program was called Werewolf. To be implemented effectively it required three things 1) arms caches, 2) The National Redoubt in the Bavarian Alps & 3) True believers to carry on the fight.
It failed because very few of the arms caches were actually in place (Speer takes credit for that. Historians now think he was exaggerating!) The National Redoubt was never built. (I think Speer takes credit for that also! Again questionable!) Given 1) & 2) didn’t happen and it even became plain to True Believers that 1) & 2) didn’t happen so their numbers tailed off and the whole thing fizzled out in a few years.
Saddam did some similar in Iraq, much more successfully!