U-455 Giessler 12-Sep-1942 8 days
Giessler was born in January 1911 and is over 100 years of age at the time of this writing. His career total was two ships sunk for 13,908 tons. Promoted to Korvettenkapitän in October of 1943, he earned the Iron Cross First Class. Over four patrols he served 185 days at sea, following which he was moved to the Torpedo Inspectorate. This was a crucially important role at the outset of the war, when many of the German torpedoes malfunctioned to the great frustration of many an accomplished U-boat skipper, with concomitant erosion of morale amongst entire crews. After a stint at the Ministry of Armaments and War Production, Giessler ended the war as First Watch Officer of the destroyer Z 20 Karl Galster.
SOURCES: Gudmundur Helgason, Rainer Kolbicz, www.uboat.net, 2013, Kenneth Wynn, U-boat Operations of the Second World War, Volume 1 and Volume 2, 1997, R. Busch, and H.-J. Röll, German U-boat Commanders of World War II, 1988, Franz Kurowski, Knights Cross Holders of the U-boat Service