In foul weather on the night of 16 September 1917, whilst escorting a convoy from Aspö Fjord Map of Aspo Fjord location 100 kilometers north of Bergen, Norway, to Lerwick, Pasley rammed and sank the submarine HMS G9 , after G9 fired two torpedoes at her, believing her to be a German U-boat; one torpedo missed, the second failed to explode. ''