Anthor Viaduct
10 Lancasters of 617 Squadron attempted to bomb this important railway link between France and Italy but, as on two earlier raids, were not successful despite low-level runs by Wing Commander Cheshire and Squadron Leader Martin. The sides of the valley were very steep and the target was defended by guns which damaged both of the low-level aircraft. Flight Lieutenant R. C. Hay, the bomb aimer in Martin's aircraft and the Squadron Bombing Leader since 617's formation, was killed.
Minor Operations: 8 Mosquitoes to Elberfeld and 4 to Duisburg, 3 Serrate patrols, 25 Halifaxes and Stirlings minelaying in the Frisians and off Cherbourg. 1 Halifax minelayer lost.
