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Background:
https://en.wikipedia.org/wiki/British_occupation_of_the_Faroe_Islands
https://en.wikipedia.org/wiki/Invasion_of_Iceland

1. How?
Both places were basically undefended; Iceland had 60 policemen - therefore, even U-Boats filled with infantry and disembarking their men either close to or literally at the main harbor could be used. Freighters using false flags and sneaking past the British blockade are another option, although it runs considerable risk of the British finding out.

After your first teams are ashore and in control of the local airstrip, faze 2 can begin - the island-hopping airlift. (OTL the Danish airport at Aalborg was used to great effect in exactly this manner)
Step 1 - from Germany/Denmark to Bergen in Norway
Step 2 - from Bergen to Thorshavn in the Faroe Islands
Step 3 - from Thorshavn to Reikjavik

At every stage, the distance is more than enough for a one-way flight by Ju-52s, with refueling done at the destination, with the fuel coming from a number of possible sources - captured locally, supplied by the U-Boats already on-site or flown in by additional Ju-52s.

After the airlifted infantry is in place, more men can be brought in by sea to Iceland (Faroes are just too exposed) by ships sneaking past the British by taking as big a detour as possible towards the north, with the caveat that this can only take place once the coastal waters around south-western Norway are reasonably secure.

All in all, it wouldn't require any sort of considerable German resources - 2-4 U-boats, ~20 Ju-52s doing multiple runs and a few hundred men, followed by one or two thousand more carried by a few transports.

2. OTL British response

OTL, it took the British almost 3 days to bring any kind of force to the Faroes - two destroyers. This was followed by the cruiser HMS Suffolk and 2 trawlers carrying a total of 200 or 250 Royal Marines (sources I found differed).

Meanwhile, Iceland was only invaded a whole month after Weserubung was launched, with the force consisting of 750 ill-equipped and seasick infantry, many of whom only got to fire their first training shots whilst en-route to the island. This was followed up by 4000 Canadians a week later, with the total force, including support elements, reaching 25.000 more than two weeks after that.

3. Possibility of German reinforcements
This I am not so sure of - however, given the geography of Iceland, I think there is some merit towards exploring the idea of Germany trying to send in the occasional convoy to bypass the British and land troops, equipment and supplies on Iceland in mid 1940, when the situation is still fluid. How feasible is this?

4. Why?

Basically, this would be a German diversionary attack, whose sole purpose would be to force the British to over-react, thus allowing more chances of success for the main operation in Norway. Once the whole thing achieves its stunning early success, the Germans might be tempted to reinforce Iceland, thus providing for some interesting battles.

I'm curious how, if at all, this would affect American public opinion

5. How long can the German forces in Iceland last, and other knock-on effects?
Would they be defeated by July 1940, or could the last longer?
Would Sealion look even more probable to the frightened British, and what kind of effects could that have? Conversely, could either the Kriegsmarine or the Royal Navy suffer losses that have knock-on effects elsewhere?
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