In order to fight England's navy, the German army in World War I came to rely upon the use of submarines (Unterseeboot, or U-Boot). The number of submarines increased from 28 (1914) to a total of 371, of which 178 were lost by the end of the war.
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Der U-Boot-Krieg, Leo Baeck Institute, r (f) DD 232.5 A7 1963 [I.15].