Operation Mardonius
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Operation Mardonius was a military operation directed against German ships in occupied Norway, planned and carried out in 1943 by the British Special Operations Executive (SOE). The outcome of the operation was sinking of two ships in the harbour of Oslo, Ortelsburg of Hamburg and Tugela.
While training with the Norwegian Independent Company 1 in England and Scotland, Max Manus and Joachim Rønneberg developed the initial draft for naval sabotage based on small magnetic limpet mines with time delay, delivered to the ship from kayaks, and using a long iron stick to place the limpet on the ship's side.[1][2] They did not get any immediate response to the plan. Later, Manus developed a revised plan along with Gregers Gram, this time much more detailed. The plans were eventually approved, and they started the preparations, doing experiments and training.[3] The two SOE agents Max Manus and Gregers Gram were sent to Norway and parachuted into Østmarka east of Oslo on 12 March 1943. They landed near the lake Øyeren, just south of Tonevann, along with several containers with weapons and provisions. Their primary mission was sabotage operation directed against German ships in the Oslofjord.[1][4][5][6][7]