 On 3 March she spotted a vessel, identified it as a British Blue Star Line merchant ship, and hit it with three torpedoes, it sank it within two minutes.Only later did "U-43" learn that it was the 5,154 ton German blockade runner "Doggerbank", formerly the British "Speybank" that had been captured by the auxiliary cruiser in January 1941.The ship was carrying 7,000 tons of rubber, fats, fish oil, and other raw materials from Yokohama to France; she was several days ahead of her scheduled arrival date.