So you think Karl Dönitz, Erwin Rommel, and Heinz Guderian were incompetents? You need to go back to your history books and double-check that idea. Yes, Rommel warned about Sea Lion, but that wasn't the reason it wasn't carried out. The Nazis had the most effective military in the world, and though Hitler clearly was insane, he had people who, left to their own devices, would have finished off England before the US was willing to get into the fight. The only reason Hitler lost that war was because he insanely drove his Eastern army into disaster. Guderian, another brilliant officer, and others warned him but he made the same, stupid mistake Charles XII of Sweden made, roughly 235 years earlier.