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Birger Kristian Eriksen (1875–1958)

Birger Kristian Eriksen (17 November 1875 – 16 July 1958) was a Norwegian military officer (with the rank of Oberst) who was instrumental in stopping the first wave of Gruppe 5 of the German invasion force outside Oslo. Eriksen was the commander of Oscarsborg Fortress when Nazi Germany attacked Norway in the early hours of 9 April 1940. He gained lasting recognition for ordering the fortress under his command to open fire on the vanguard forces of Operation Weserübung, sinking the 16,000-ton heavy cruiser Blücher.
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