<page_title> Günther Prien </page_title> <section_title> Ships attacked </section_title> <table> <cell> 6 September 1939 <col_header> Date </col_header> </cell> <cell> SS Rio Claro <col_header> Ship </col_header> </cell> <cell> United Kingdom <col_header> Nationality </col_header> </cell> <cell> 4,086 <col_header> Tonnage </col_header> </cell> <cell> Sunk at 46°30′N 12°00′W / 46.500°N 12.000°W <col_header> Fate </col_header> </cell> <cell> 7 September 1939 <col_header> Date </col_header> </cell> <cell> SS Gartavon <col_header> Ship </col_header> </cell> <cell> United Kingdom <col_header> Nationality </col_header> </cell> <cell> 1,777 <col_header> Tonnage </col_header> </cell> <cell> Sunk at 47°04′N 11°32′W / 47.067°N 11.533°W <col_header> Fate </col_header> </cell> </table>
Günther Prien's boat sank two British vessels, Rio Claro of 4,086 GRT on the 6th, and Gartavon of 1,777 GRT on the 7th.