The "Germany insurgency" is an urban myth.
My father was in Dusseldorf in '45 and remembers unexplained sniper shootings and explosions - insurgency? Who knows?
http://pqasb.pqarchiver.com/nytimes/93095079.html?did=93095079&FMT=ABS&FMTS=AI&date=May+12,+1946&author=&desc=TWO+GI%27S+MURDERED+IN+GERMAN+AMBUSH
http://pages.prodigy.net/aesir/wer.htm