247 Lancasters and 8 Mosquitos of Nos 1 and 8 Groups to attack what were believed to be military barracks near Nordhausen. Unfortunately, the barracks housed a large number of concentration-camp prisoners and forced workers of many nationalities who worked in a complex of underground tunnels where various secret weapons were made. The camp and the tunnel workshops had been established immediately after Bomber Command attacked the rocket-research establishment at Peenemünde in August 1943.
The bombing was accurate and many people in the camp were killed; the exact number is not known. The men working in the tunnels were unhurt. 2 Lancasters lost.
