Prisoners taken from merchant ships by Admiral Graf Spee who had been transferred to her supply ship Altmark were freed by a boarding party from the British destroyer HMS Cossack, in the Altmark Incident (16 February 1940)—whilst in Jøssingfjord, at the time neutral Norwegian waters.
Os prisioneiros de mercantes collidos polo Admiral Graf Spee que foran transferidos ao barco de apoio Altmark foron liberados por un grupo de abordaxe do destrutor británico HMS Cossack, no Incidente Altmark (o 16 de febreiro de 1940), ocorrido en Jøssingfjord que naquel momento eran augas neutrais norueguesas.