While the odds were against any sort of meaningful Swiss victory in the event of invasion, such a German offensive was equally unlikely in the early years of the war. By 1943, the possibility of a successful German invasion had dwindled to virtually nothing, as the Swiss Army had expanded and modernized to a point that would make Tannenbaum a suicidal mission. This begs the question: why, then, would Hitler ever have chosen to invade Switzerland? Let us proceed with our counterfactual under the following premises.

It is now September 15. The unrestricted bombing campaign authorized by Churchill four months ago has been relatively unsuccessful. Fewer than 25 percent of the bombs dropped are landing within five miles of their intended targets, and only 30 percent have landed in any built-up areas.[1] However, this has had an unintended benefit. Having disguised the few industrial plants manufacturing jewel bearings, the Germans were fairly certain of their security. However, in a truly ironic case, this ended up being more costly, as the plants have been disproportionately hit by the British bombs. Jewel bearings are a main component of bombsights, and without them, Hitler is reluctant to press his luck in the Battle of Britain, much less Operation Sealion.

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