The sinking of the Blücher by aging Norwegian coastal defenses delayed the German occupation of Oslo, allowing King Haakon VII to escape.
Key Facts
- Date
- 9 April 1940
- Key Fortress
- Oscarsborg Fortress
- German Flagship Sunk
- Cruiser Blücher
- Location
- Drøbak Sound, outer Oslofjord, Norway
- German Objective
- Capture Oslo and King Haakon VII
Location
Cause → Event → Consequence
Germany launched an invasion of Norway on 9 April 1940, dispatching a fleet led by the cruiser Blücher up the Oslofjord with orders to seize Oslo, capture King Haakon VII, and install German control. German intelligence had dismissed Oscarsborg Fortress as an outdated training installation with little defensive capability.
As the German fleet advanced through Drøbak Sound, Oscarsborg Fortress opened fire with its coastal artillery and deployed its torpedo battery. The weapons performed effectively, striking the Blücher and causing it to sink in the fjord. The rest of the German fleet was forced to withdraw, unable to proceed directly to Oslo.
The loss of the Blücher, which carried the bulk of the troops and Gestapo agents assigned to occupy Oslo, delayed the German takeover of the Norwegian capital. This delay gave King Haakon VII and his government sufficient time to evacuate Oslo, allowing them to continue Norwegian resistance against the German occupation.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Side B
1 belligerent