As the submarine fired two torpedoes , it was caught on the surface by Weyburn .
It was during this meeting at 03 : 00 on 3 September that U-517 commenced a surface attack on the convoy , firing into convoy LN - 7 from its southern flank .
As the submarine fired two torpedoes , U-517 was caught on the surface by Weyburn .
It was during this meeting at 03 : 00 on 3 September that U-517 commenced a surface attack on the convoy , firing into convoy LN - 7 from its southern flank .