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A highlight of cutter North Star's work with the Greenland Patrol was the assistance she rendered in the 12 September 1941 seizure of the Norwegian trawler Buskoe, which was controlled by German interests for the purpose of servicing Nazi radio and weather stations in Greenland. The captured trawler and her crew and passengers were taken to Boston, Mass. for internment.

With the official declaration of war 8 December 1941, North Star remained on station with the Greenland Patrol. She was especially useful in providing services to east Greenland stations between 13 August and 23 September 1942. She was attacked by a Nazi reconnaissance plane north of Jan Mayen Island 23 July 1943. The plane withdrew from the engagement and trailed heavy black smoke as it disappeared over the horizon. North Star also investigated the German camp at Sabine Island, East Greenland 31 August.