. . "Walther Forstmann (March 9, 1883 \u2013 November 2, 1973) was one of the most successful and highly decorated U-boat commanders in the Kaiserliche Marine during World War I. He also served in the Kriegsmarine during World War II in different staff positions.In his time as commander of U-12 and U-39 in World War I, he conducted 47 patrols and succeeded in sinking 146 ships for a total tonnage of 384,304 gross register tons (GRT)."@en . . "1883-03-09Z"^^ . ", February 11, 1915 \u2013 October 14, 1917" . . ", August 1, 1914 \u2013 February 9, 1915" . "Walther Forstmann"@en . "1900Z"^^ . "1973Z"^^ . . "1883Z"^^ . "1973-11-02Z"^^ . "Forstmann, Walther"@en . . "German World War I U-boat commander" . .