On April 9, 1940, during the early hours of Operation Weserübung, a German naval squadron led by heavy cruiser Blücher advanced into Oslofjord to capture Oslo, the Norwegian King, and the government.

The mission aimed to secure Norway’s strategic position and control over vital resources; however, as the squadron neared Drøbak Sound, the Oscarsborg coastal fortress opened fire on the fleet, severely damaging Blücher.

Blinded by searchlights and under heavy fire, the German crew failed to respond effectively, and Blücher was eventually sunk. The attack delayed the German assault, giving the Norwegian King and government critical time to escape and continue their resistance, which would significantly disrupt Germany's plans for a swift victory in Norway.

Watch our video to dive into the details of this dramatic turning point in the early stages of World War II.