These Luftwaffe target maps were found by the vendor (then a captain in the Royal Artillery) towards the end of the Second World War in the operations room of a Luftwaffe bomber airfield at Stade, on the Elbe estuary, west of Hamburg. At that time, the British Army overran the area. The Germans attempted to set fire to the operations room, but the sprinkler system was activated by shelling and put out the fire. There were piles of such target maps, some of which had clearly been used in raids and returned.
The vendor notes that 'there was plenty of evidence in that Operation Room to suggest that the Stade Airfield had played a major role in the bombardment of Britain from 1941 onwards.'
See also: D/DM/1493 - Target map of Broughton area.