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Oscarsborg Fortress

Oscarsborg Fortress is a coastal fortress on islands in the Drøbak Sound of the Oslofjord, south of Oslo, built mainly in the mid-nineteenth century. On 9 April 1940 its old guns and torpedo battery sank the German heavy cruiser Blücher, which was carrying troops to occupy Oslo. The delay allowed King Haakon VII, the government and the gold reserves to escape the capital.

Oscarsborg Fortress
Image: Kjetil Lenes · CC BY 2.5 · Wikimedia Commons
Cite this entry
APA
The Epoch Institute. (2026). Oscarsborg Fortress. In The Epoch Institute Encyclopedia. https://the-epoch-institute.org/encyclopedia/oscarsborg-fortress
MLA
“Oscarsborg Fortress.” The Epoch Institute Encyclopedia, The Epoch Institute, 2026, https://the-epoch-institute.org/encyclopedia/oscarsborg-fortress. Accessed .
Chicago
The Epoch Institute. “Oscarsborg Fortress.” The Epoch Institute Encyclopedia. 2026. https://the-epoch-institute.org/encyclopedia/oscarsborg-fortress.
Harvard
The Epoch Institute (2026) ‘Oscarsborg Fortress’, The Epoch Institute Encyclopedia. Available at: https://the-epoch-institute.org/encyclopedia/oscarsborg-fortress (Accessed: ).

Last reviewed October 2026Random entry ↻