http://www.ibiblio.org/hyperwar/USMC/US ... eland.html
Detailed article about landings there.
The next day the convoy went through the flotsam and jetsam of the British battleship HMS Hood, which had been sunk by the German pocket battleship Bismarck on 24 May. Items of equipment from the Hood floating alongside their ships brought the war to the close attention of sober Marines lining the rails of their transports.
The British veterans were properly
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concerned about the German capability of mounting air and parachute attacks. Iceland was well within range of German forces occupying Norway, and during the late summer months of long daylight the Germans sent lone reconnaissance planes high over the island on photo missions, usually before reveille on Sundays.
The interior of the barn was decorated by a British officer, a talented and successful theater designer in civilian life, to resemble scenes of an English village pub.
Col Clifton M. Craig Collection
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When the Germans flew over, warning sirens, bells, gongs, and whistles went off. Foggy marines milled around, half dressed, as they donned helmets, gas masks, and their clothes and took up their arms. British antiaircraft artillery fired a few rounds, but usually the Nazi planes were long gone. Because the U.S. was not yet at war, the American flag was not flown over any marine camps purportedly to keep the Germans from identifying them as such. However, some Marines manned .30-caliber antiaircraft machine gun positions and acted as though an invasion was impending.