<page_title> German submarine U-21 (1936) </page_title> <section_title> Summary of raiding history </section_title> <table> <cell> 21 December 1939 <col_header> Date </col_header> </cell> <cell> Carl Henckel <col_header> Name </col_header> </cell> <cell> Sweden <col_header> Nationality </col_header> </cell> <cell> Sunk <col_header> Fate </col_header> </cell> <cell> 21 December 1939 <col_header> Date </col_header> </cell> <cell> Mars <col_header> Name </col_header> </cell> <cell> Sweden <col_header> Nationality </col_header> </cell> <cell> Sunk <col_header> Fate </col_header> </cell> </table>
German submarine U-21 sank Mars and Carl Henckel both from Sweden on 21 December 1939.