English: An Avro Lancaster of No. 1 Group, Bomber Command, silhouetted against flares, smoke and explosions during the attack on Hamburg, Germany, by aircraft of Nos. 1, 5 and 8 Groups on the night of 30/31 January 1943. This raid was the first occasion on which H2S centimetric radar was used by the Pathfinder aircraft to navigate the force to the target. The pilot of the photographing aircraft (Lancaster 'ZN-Y' of No. 106 Squadron, based at Syerston) was Flt Lt D J Shannon who, as a member of No. 617 Squadron, took part in Operation CHASTISE (the "Dams Raid") during the following May.