SM U-139 explained

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

See also: 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.[1]

Summary of raiding history

DateNameNationalityTonnage[2] Fate[3]
1 October 1918Bylands United Kingdom3,309Sunk
1 October 1918Manin2,691Sunk
1 October 1918HMS Perth2,502Damaged
2 October 1918Rio Cavado Portugal301Sunk
14 October 1918Augusto De Castilho487Sunk

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Notes and References

  1. James H. Guill, "the only battle of note that occurred near the Azores during this period took place 14 October 1918 between the German U-139 and Portugal's ships São Miguel and Augusto Castilho.", page 507.
  2. Merchant ship tonnages are in gross register tons. Military vessels are listed by tons displacement.
  3. u139. U 139. 1boat. 7 December 2014.