the Arctic, 07 Dec 1941: Attack on Pearl Harbor
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4 Sep 1941Greer incident:
US destroyer clashes
with U-boat

11 Sep 1941“Shoot-on-sight”
order given to USN

12 Sep 1941US seizes Norw. boat
off Greenland,
claiming it’s German

Oct–Nov 1941Germans set up
base in Svalbard