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https://en.wikipedia.org/wiki/Mole_(architecture)#World_War_II_Dunkirk_evacuation
I've been listening to a history podcast review of the new Dunkirk film and they're discussing the importance of the Dunkirk Mole to the evacuation after the port was wrecked by bombs, as ships didn't have to worry about the tide and could actually come up two abreast to evacuate men 1 mile out in to the sea. They also noted that the Luftwaffe never bombed it (or at least never hit it). What if they had targeted it and successfully knocked out the Mole? What happens to the evacuation then? Let's say it happens relative early, on the 28th of May. The East Mole was used to evacuate 200,000 men between 28th of May through to the end of the evacuation.
https://en.wikipedia.org/wiki/Dunkirk_evacuation#28_May_.E2.80.93_4_June
What do the Brits do to cope with the Moles being rendered unusable and what happens if the evacuation then sees only about 50% of the men evacuated as compared to OTL?
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