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:
- Unterseeboot B-4, built in 1915 and sunk in the same year.
- Unterseeboot C-4, built in 1915 and scuttled in 1918.
- During the First World War, Germany also possessed the submarines:
- Unterseeboot 4 (1935) was a submarine built in 1935, and stricken in 1944.
- Unterseeboot 4 (S183) was a Type 205 submarine of the Bundesmarine, built in 1962, and scrapped in 1974.