Convoy SC-100 was the 100th of the numbered series of World War II Slow Convoys of merchant ships from Sydney, Cape Breton Island to Liverpool. The convoy departed Halifax on 12 September 1942 and was joined on 16 September by Mid-Ocean Escort Force Group A-3. The convoy had been scattered by an equinoctial storm when U-boats found it on 18 September. The ships of Group A-3 were not fast enough to catch surfaced U-boats; and the U-boats sank five scattered ships before losing contact on 25 September. Surviving ships reached Liverpool on 28 September.
The convoy was ecorted by the following allied warships:-
13 Corvettes
HMCS Bittersweet, HMCS Kenogami, HMCS Louisburg, HMCS Lunenburg, HMCS Matapedia, HMCS Mayflower, HMCS Moose Jaw, HMS Nasturtium, HMCS Prescott, HMCS Rosthern, HMCS Trillium, HMCS Weyburn, HMCS Woodstock
2 Destroyers
ORP Blyskawica, HMCS Niagara
1 Sloop
HMS Deptford
1 ASW Trawler
HMS Kingston Beryl
1 Frigate
HMS Rother
1 LST
HMS Narvik
2 Treasury-class cutter
USCGC Campbell, USCGC Spencer
The convoy was attacked by both Wolfpack Lohs comprising 9 u-boats, and 8 u-boats from Wolfpack Pfeil, namely
U-135 – Kapitänleutnant Friedrich-Hermann Praetorius
U-176 – Kapitänleutnant Reiner Dierksen
U-259 – Kapitänleutnant Klaus Köpke
U-373 – Kapitänleutnant Paul-Karl Loeser
U-410 – Kapitänleutnant Kurt Sturm
U-432 – Kapitänleutnant Heinz-Otto Schultze
U-569 – Kapitänleutnant Hans-Peter Hinsch
U-599 – Kapitänleutnant Wolfgang Breithaupt
U-755 – Kapitänleutnant Walter Göing
U-216 – Kapitänleutnant Karl-Otto Schultz
U-221 – Kapitänleutnant Hans-Hartwig Trojer
U-258 – Kapitänleutnant Wilhelm von Mässenhausen
U-356 – Kapitänleutnant Georg Wallas
U-595 – Kapitänleutnant Jürgen Quaet-Faslem
U-607 – Kapitänleutnant Ernst Mengersen
U-615 – Kapitänleutnant Ralph Kapitzky
U-617 – Kapitänleutnant Albrecht Brandi
