 170 Squadron was re-formed on 15 October 1944 at RAF Kelstern from C Flight of 625 Squadron, moving shortly to RAF Dunholme Lodge then again to RAF Hemswell.Equipped with the four-engined Avro Lancaster heavy bomber it was soon operating as part of the Bomber Command offensive over Germany through the winter of 1944/45.As the risk from German fighters grew less it also operated daylight raids.