Avro Lancaster B Mk.I special, PB996, YZ-C, No. 617 Squadron, Fl. Ofc. P. Martin drops Grand Slam at Arnesberg, 19 March 1945 (IWM) Published on March 13, 2013 in 19 March 1945Full resolution (577 × 423) Next → The Grand Slam bomb drops away from the No. 617 Squadron Lancaster B Mk.I Special, YZ-C, 19 March 1945. (Imperial War Museum)