Norwich suffered extensive bomb damage during the Second World War, affecting large parts of the old city centre and Victorian terrace housing around the centre. Industry and rail infrastructure also suffered. The heaviest raids occurred on the nights of 27/28 and 29/30 April 1942; as part of the Baedeker raids; attacks on Bath, Canterbury, Norwich, Exeter, and York using Baedeker's series of tourist guides to the British Isles. Norwich became one of the targets of the so-called "Baedeker Blitz", which took place in retaliation for the bombing of Lübeck by the RAF earlier that year.