I just find it hard to state a level of stupidty that was beyond the Nazis. Hitler was amatauer strategiest of the worst sort he had no idea. He was quite capabel of ordering Sealion which teh German military would have tried against the Navy's better judgement. People may rightfully disagree because judgements of Hitler's decision making process is any pretty sketchy and hypothetical. I think when he ordered th enitail preperations he thought the British might well just roll over, that sea Lion might work. And the cold feet of the Navy and he got less serious about it. But do not think it began as a bluff.Well yeah it was a bluff cause they were never going to do it. That didn't mean it was impossible or they didn't have the resources. Unlike in WWI where it was almost literally impossible.