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.
- Unterseeboot 91 (1942) was built in 1942 and operated in the Second Battle of the Atlantic during the Second World War before being sunk in 1944.