SM U-139
Introduction Weather flag of SM U-139 at the National Museum of the United States Air Force. '''SM ''U-139''''' was the lead ship of her class, one of the submarines serving in the Imperial German Navy in World War I. She was commissioned on 18 May 1918 under the command of Lothar von Arnauld de la Perière, who named the submarine ''Kapitänleutnant Schwieger'', after Walther Schwieger, who had sunk the  in 1915.She only sailed on one war patrol, during which she sunk four ships. ''U-139'' surrendered to France on 24 November 1918 and shortly afterwards became French submarine ''Halbronn'' (until 24 July 1935 when she was broken up).
Action of 14 October 1918 On the 14 October 1918, ''U-139'' attacked the Portuguese civilian steamer SS ''São Miguel'', which was being escorted by the Portuguese Navy small naval trawler NRP ''Augusto de Castilho'' in the Atlantic Ocean. ''Augusto Castilho'' covered the escape of ''São Miguel'' by engaging ''U-139'' for several hours, until being destroyed.
Summary of raiding history DateNameNationalityTonnageFate1 October 1918''Bylands''3,309Sunk1 October 1918''Manin''2,691Sunk1 October 1918HMS ''Perth''2,502Damaged2 October 1918''Rio Cavado''301Sunk14 October 1918''Augusto De Castilho''487Sunk
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