How Cossack boarded Altmark

The documentary record is uncertain, but the tactical sequence is clearer: Norwegian inspections had been confused or incomplete, Altmark retreated into Jøssingfjord, and Cossack entered to verify her status. Vian signalled that he intended to inspect the ship despite the presence of Norwegian torpedo boats. When Altmark attempted to use her engines and searchlights against the destroyer, the ships closed enough for grappling hooks and boarding parties. Sailors crossed in successive waves, freed the prisoners, and left Altmark aground rather than taking her as a prize. Conflicting recollections still limit how confidently some details of this improvised boarding can be stated.