The terror raids of 1942: the Baedeker Blitz, by Jan Gore – Pen & Sword Blog
‘We shall go out and bomb every building in Britain marked with three stars in the Baedeker Guide’ the German Foreign Office announced in April 1942, as the Luftwaffe attacked Exeter, Bath, Norwich, York and Canterbury. This might have been a challenge, as there were no three star buildings in the guide. Nevertheless, it was this comment that gave the Baedeker Blitz its name. These attacks were direct retaliation for RAF raids on equally historic German cities, such as Lübeck. Hitler ordered that ‘Preference is to be given…where attacks are likely to have the greatest possible effect...
Source: pen-and-sword.co.uk