Helmuth von Ruckteschell
Hellmuth Max von Ruckteschell was an officer in the Kaiserliche Marine and the Kriegsmarine, serving in both World War I and World War II. He was one of the most successful merchant raider commanders, serving as the captain of the German commerce raiders Widder and Michel during World War II. However, he was ruthless in the execution of his duties, and after the war was convicted of war crimes.
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Source: Wikipedia