Mont Saint Michel is small, but I'm guessing they would have been able to welcome more people in by making the old shops and hotels into houses. People could also live in the abbey, like the monks do today.
I'm sure that many hundreds would fit. they would have to define some strict rules for mating, to guarantee an adequate mix... That could be a good driving plot for a story...
I'm picturing that one community (the upper class - the "court", officers, doctors, artisans, etc...) would live in the Abbey, while the others (the peasants) lived in the remaining surrounding houses, working mostly on the land (and fishing).
Yeah, and maybe over time they could have managed to arrange some foraging on the mainland to supplement the food grown on the island? Still, it would be a small community (well, two small communities). Perhaps some of them could be tourists stranded there who have very different heritage to add to the mix, Asian for example?
Surely. Raiding the nearby areas and, perhaps, being in contact (by boat) with other communities to "exchange" people and avoid genetic problems.
I added the following to that start line:
"The year is 90. France is entirely occupied by trolls. Well, not entirely... A small island of indomitable Bretons and Normands still holds out against the infected. And life is not easy for the trolls who inhabit the old ruins of the nearby towns of Beauvoir, Pontorson, Gênets and Saint-Léonard."
(this is BTW something I feel we should see in Iceland of the comic, blended in a bit by now, but still showing in some of the population. There are always loads of tourists there, some of whom certainly got stuck, and also the NATO base has rotating troops who may have stayed)
Yes, I agree. BTW I'm sure that said NATO base would be crowded with hundreds of NATO vessels that would reach for the last remaining haven, and there is nothing the small Iceland navy could do to prevent 2 or 3 aircraft carriers, their escorts and a bunch of nuclear subs to arrive.