Well, if you want a chart of enemies of Germany, the top rated enemy has to be Germany! Such stupidity! You can't even tell how they lost the war because they made dozens of fatal mistakes, any one of which was sufficient to guarantee their defeat.
But just taking our end of the war, the moment they built the first Type VII they had the war lost. Germany had no business building submarines for an offensive war. Using them guaranteed them the loss before the first shot in the war was fired. There was no escape. They doomed themselves, considered the situation and then did the deed anyway. That is stupidity of a degree that makes anything the Japanese did look brilliant.
But if they hadn't stupidly used submarines, we may have used them wrongly and lost our submarine battle of the Pacific.
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