Kapitänleutnant Walther Schwieger (Wilhem Otto Walther Schwieger) (7 April 1885 – 5 September 1917) was a U-boat commander in the Imperial German Navy (Kaiserliche Marine) during First World War. In 1915, he sank the passenger liner RMS Lusitania with the loss of 1,199 lives.
Vizeadmiral Lothar von Arnauld de la Perière (German: [ˈloːtaʁ fɔn ʔaʁˈnoː də la peˈʁi̯ɛːɐ̯]; 18 March 1886 – 24 February 1941), born in Posen, Prussia, and of French-German descent, was a German U-boat commander during World War I. With 194 ships and 453,716 gross register tons (GRT) sunk, he is the most successful submarine captain ever. His victories came in the Mediterranean, almost always using his 8.8 cm deck gun. During his career he fired 74 torpedoes, hitting 39 times.Arnauld de la Perière remained in the German Navy (Reichsmarine) after the war ended. During World War II, he was recalled to active duty as a rear admiral, and was killed in a plane crash near Paris in 1941.