Unterseeboot 91

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Unterseeboot 91 or U-91 has been the name of several German submarines or U-boats during the First World War and the Second World War.

  • Unterseeboot 91 (1917) was built in 1917 and operated in the First Battle of the Atlantic during the First World War before being surrendered in 1918.
    • During the First World War, Germany also operated two other U-boats with similar designations:
      • Unterseeboot B-91 was built in 1918 and surrendered the same year.
      • Unterseeboot C-91 was built in 1918 and sunk in 1919.