SM U-4 (Germany)
SM U 4 ( His Majesty's Submarine 4) was a German U- boat of the Imperial Navy.
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U 4 was built by the Kaiserliche Werft in Danzig. It was one of a total of 329 German U- boats in the First World War. U 4 was used over the entire duration of the war for training purposes and therefore did not generate any sinking successes.