At 23.46 hours on 22 Sep 1941, U-103 fired four bow torpedoes at convoy SL-87 southwest of the Canary Islands, turned around and fired two stern torpedoes at 23.47 hours. They observed a ship capsizing after a small explosion and two other ships going down by their sterns after two further explosions. The fourth torpedo was a shallow hit causing a large column of water and the fifth exploded with a blue-green flash. Winter thought that four ships were sunk and another damaged. However, the Edward Blyden and Niceto de Larrinaga were each hit by two torpedoes.

The master, 46 crew members, four gunners and 12 passengers from the Edward Blyden (Master William Exley) were picked up by HMS Bideford (L 43) (LtCdr W.J. Moore, RNR) and landed at Londonderry on 5 October.