SM U-13

SM U-13 was one of the 329 submarines serving in the Imperial German Navy in World War I. U-13 was engaged in the naval warfare and took part in the First Battle of the Atlantic.

She had left Heligoland on 6 August 1914 and was not heard from again. She may have been a victim of the German defensive minefield in Heligoland Bight, or from an accident or mechanical failure.