 Following the Luftwaffe's defeat in the Battle of Britain, it began night attacks on Britain's cities ('The Blitz').3rd AA Division's responsibilities were split in November 1940 and a new 12th AA Division created, to which 42nd AA Bde was transferred, with its responsibility restricted to the defence of Glasgow and the Firth of Clyde.The industrial town of Clydebank near Glasgow was badly hit on the nights of 13/14 and 14/15 March 1941 in the 'Clydebank Blitz', but none of the raiders was brought down by AA fire.