Churchill personally ordered Captain Philip Vian of the destroyer HMS Cossack to board the German supply ship Altmark in Norwegian waters

On 16 February 1940, Churchill personally ordered Captain Philip Vian of the destroyer HMS Cossack to board the German supply ship Altmark in Norwegian waters and liberate some 300 British prisoners who had been captured by the Admiral Graf Spee. These actions, supplemented by his speeches, considerably enhanced Churchill's reputation.