Unterseeboot 4

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Unterseeboot 4 or U-4 has been the name of several German submarines or U-boats during the First World War, the Second World War and in the post-war Bundesmarine.

  • Unterseeboot 4 (1909) was a submarine built in 1909, and stricken in 1919.
    • During the First World War, Germany also possessed the submarines: