SM U-23 was one of the 329 U-boats serving in the Imperial German Navy in World War I.
U-23 was engaged in the naval warfare and took part in the First Battle of the Atlantic.
U-23 served on three war patrols, sinking a total of seven ships for . She was baited by the Q ship Princess Louise and torpedoed by at , off Fair Isle, in Shetland, Scotland. Twenty four men died and 10 survived.
Summary of raiding history DateNameNationalityTonnageTonnages are in gross register tonsFate13 March 1915Invergyle1,794Sunk15 March 1915Fingal1,562Sunk15 May 1915Martha1,182Sunk19 May 1915Chrysolite222Sunk19 May 1915Crimond173Sunk19 May 1915Lucerne154Sunk22 May 1915Minerva3,735Sunk
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