22 Halifaxes from 408 and 419 Squadrons were joined by 40 Wellingtons from 420, 424, 425, 426, and 427 Squadrons on an attack on the dock area of Lorient. This attack took place with the crews over the target at between 11,000 and 19,000 feet dropping 90,000 lbs of high explosives and 100,000 lbs of incendiaries. The crews encountered severe icing and bad weather over the target. Bombing was scattered.

Sgt D. Childers of 408 Squadron returned early the gee box was u/s.
F/Sgt D. Smith returned early as they were using too much fuel.
Sgt A. Cochrane and crew flying Halifax II DT-676 coded EQ-B were in a combat with a JU-88, there was no claim or damages.
F/Sgt A. Ross encountered severe icing, the stbd inner quit, as well as some instruments. They landed safely at Squires Gate.
Sgt E. Sirett had the port inner quit due to icing. They landed safely at Colerne.
F/Sgt F. Wood had the stbd outer and port inner quit due to icing after releasing the load, aircraft lost 5,000 feet in a flat spin. The Flt/engineer was able to restart the engines and they landed safely at Syerston due to a fuel shortage.
F/O T. Roux RAF and crew, flying Halifax II  HR-662 coded EQ-H, failed to return from this operation. 
        Sgt F. Cavadino RAF
        P/O E. Payling RAF
        Sgt J. Rostron RAF
        Sgt W. Barton RAF
        P/O R. Brinkworth RAF
        Sgt J. Adam RAF
All were killed.

Sgt B. Heintz of 419 Squadron was followed by an unidentified aircraft. Evasive action was taken but caused a fuel shortage. They then returned to base, the aircraft turned out to be a Beaufighter.
Sgt A. Bell returned early due to navigation aids going u/s.
P/O M. McLaughlin returned early as the oxygen system was u/s.
Sgt J. MacKenzie returned early as the navigation aids were u/s.
Sgt L. Bakewell returned early. Stbd inner was u/s, they landed safely at base on 3 engines.
Sgt B. Lavasseur returned early, port inner was u/s, they landed safely at base on 3 engines.
F/Lt A. Cranswick RAF and crew, flying Halifax II  DT-623 coded VR-S, belly landed at base on return.

Sgt F. Johnston RAF
W/O W. McRobbie RAF
F/Sgt J. O'Connor RCAF
F/Sgt D. McKenzie RAF
P/O J. Garton RAF
F/Sgt I. Howard RAF

F/Sgt D. Wilson of 420 Squadron returned early as he blacked out. They landed safely at Turweston.
S/Ldr D. Jacobs landed at Westcott on return.
F/Sgt J. Thomson landed at Gamsdon on return.
F/Sgt G. Tubman returned early as the gee box was u/s.
W/O2  D. Sanderson RCAF and crew, flying Wellington III  DF-626 coded PT-Y, crashed near Exeter on outbound. 

F/Sgt C. Downton RCAF
F/Sgt H. Sealy RCAF
Sgt P. Beauchamp RCAF
Sgt J. Bittner RCAF
Sgt H. Ernst RCAF

P/O E. Stanton RAF and crew, flying Wellington III  DF-615 coded PT-S, failed to return from this operation. 

F/O W. Marks RCAF
P/O F. Noon RAF
Sgt W. Goode RAF
Sgt J. Desrosiers RCAF

Sgt G. Duffield and crew from 424 Squadron flying Wellington III BJ-658 coded QB-Q were involved in combat with 5 unidentified enemy aircraft after leaving the target, there was no claim or damage.  The crew returned safely to Chipping Warden.
Sgt B. Dugas returned early due to the port engine being u/s.
Sgt E. Cox returned early due to his port engine being u/s.
Sgt G. Bain landed at Moreton-in-the-Marsh due to bad weather.
F/Sgt L. Copenhaver landed at Lulsgate Bottom due to bad weather.
Sgt A. Grout landed at Exeter due to bad weather.
F/O G. Amies was hit by flak over the target, they returned safely, landing at Chipping Warden.
Sgt P. Heden landed on return at Exeter as the port engine was running poorly.
Sgt R. Buie RCAF and crew, flying Wellington III  BK-436 coded QB-P, was hit by flak over the target. Aircraft went into a spin losing 10,000 feet. The escape hatch blew off on the way down. Sgt Buie was covered in dust and blood and his hands were frozen. The crew made their way back to England and then discovered that they had only 50 gallons of fuel left. 

P/O K. Wade RCAF
Sgt L. Taylor RCAF
Sgt H. Cook RAF
Sgt A. Lees RCAF
Sgt H. Davis RAF

F/Sgt C. Spooner of 425 Squadron returned early as the port engine and oxygen system was u/s. They landed safely at base.
Sgt F. Smith returned early as the gee box was u/s.
Sgt J. Delisle returned early as the radios were u/s.
Sgt M. Perron returned early as the oxygen system was u/s.
Sgt F. Turcotte returned early as the intercom was u/s.
F/Sgt A. Jackson and crew, flying Wellington III X-3648 coded KW-R, were in combat with a JU-88 at 20:20 just after crossing the French coast near Lorient. Sgt G. Chaput gave the dive port and opened fire. There were no strikes seen and they were not damaged. The JU-88 was not seen again. They landed at St. Eval on return due to bad weather.

Sgt H. Rands of 426 Squadron returned early as the navigational aids were u/s.
W/O2 P. Maries returned early as they encountered severe icing.
P/O J. McNeill returned to base early as the encountered severe icing losing 9,000 feet of altitude in a spin.
Sgt J. Gauthier landed at Topcliffe on return due to a fuel shortage.

Sgt G. Vandekerchkove from 427 Squadron returned early as the rear guns were u/s.

As well as the crews that went to Lorient, 420 Squadron sent 4 crews on a mining operation. 2 @ 1,500 lb mines were sown from 900 feet.

F/Lt R. Cook returned to base as they could not find the pinpoint.
P/O S. Dunn returned to base as they could not find the pinpoint.
F/Lt L. Anderson could not find the pinpoint and landed at Colerne.