When the night Blitz began over London in September, the gunners of 188 and later 189 HAA Btys were loaned to 1 AA Division to man guns covering the London Inner Artillery Zone, while 270 and two Troops of 286 HAA Bty from 91st HAA Rgt in the Humber Gun Zone arrived to augment 67th HAA Rgt at Sheffield. The CO of 67th HAA Rgt was acting as AA Defence Commander (AADC), Sheffield Gun Zone, with his HQ at the drill hall at Rotherham. During November, AA Command scraped together a further 16 mobile 3.7-inch guns for Sheffield, to be manned by various batteries under the AADC.
