596 aircraft (324 Lancasters, 218 Halifaxes, 54, Stirlings)
A special raid carried out by bomber command  on the German research establishment on the Baltic coast where V-2 rockets were being built and tested.
8 Mosquitoes carried out a diversion raid on Berlin which drew off night fighters (no mosquitoes were lost)
560 aircraft bombed the target, dropping approximately 1,800 tons of bombs.
Bomber Command losses were 40 aircraft (23 Lancasters, 15 Halifaxes and 2 Stirlings)
It is estimated that this raid set back the V-2 experimental programme by at least 2 months and reduced the scale of the eventual rocket attack.
Information source. The Bomber Command War Diaries. Martin Middlebrook and Chris Everitt