How did Norway fall so quickly? I would have thought that with the mountains and bitter cold plus allied help Norway would have been able to hold out for longer. Plus considering the size and terrain of Norway it seems like it would be a slog to take it all. So how did Germany do it so quickly?
I would have thought that with the mountains and bitter cold ...
Somebody will give you a more in-depth answer for about the war in Norway and the resistance. But your assumption of bitter cold is not correct: German invasion started in April 1940. Oslo has an average high temperature of 10 degrees Celsius (50 F) in April. Not really summer, but neither "bitterly cold"