Helmut Rosenbaum

Helmut Rosenbaum was a Korvettenkapitn in Nazi Germanys Kriegsmarine during World War II who commanded Uboat U2, U73 and the 30th Uboat Flotilla. He received the Knights Cross of the Iron Cross, awarded to recognize extreme battlefield bravery or successful military leadership. He is credited with the sinking of six ships for a total of 35,171160gross register tons160 and three warships.

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Source: Wikipedia