Commanded by
SM U-20 (Germany) → Walther Schwieger: Commanded by. SM U-20 was a German Type U 19 U-boat built for service in the Imperial German Navy. She was launched on 18 December 1912, and commissioned on 5 August 1913. During World War I, she took part in operations around the British Isles. Kapitänleutnant Wilhelm Otto Walther Schwieger was a German military officer. He was a U-boat commander in the Imperial German Navy during First World War. In 1915, he sank the passenger liner RMS Lusitania with the loss of 1,198 lives.