alternatehistory.com

I'd say that it's common knowledge that Gibraltar was an important base for the Allies, and the British in particular, during WWII. The Rock commanded sea traffic into and out of the western Med, offered a safe and effective harbor for Allied shipping, and helped aid in the defense of Malta.

But WI Gibraltar had come under a true threat, as in a German/Spanish/Italian invasion? Would such an invasion be plausible or is it doomed to failure like our favorite marine mammal? How would such an invasion proceed, and could it have any chance of being successful?
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