After 15 September the Luftwaffe concentrated on night raids – the London Blitz – which went on night after night.
On 12 October, 3 HAA Bty was brought up from Cornwall to rejoin 6 HAA Rgt, taking over ZS23 and ZS26 sites, allowing 328 HAA Bty to return to its parent regiment (104th HAA Rgt).
Shortly afterwards 15 HAA Bty was also brought back from Bristol, taking over sites ZW7 (Chingford) and ZE18 (Queen Elizabeth), both north of London under 4th HAA Rgt.
Later 3 and 12 HAA Btys were concentrated in a 16-gun site at ZS34 (Addington).
By now most of the gunsites were well equipped with 3.7-inch guns, Sperry predictors, and GL Mk I radar with an elevation finding (E/F) attachment, which slowly improved the success rate of the guns in the IAZ: on 19 November, 12 Bty scored its first 'bullseye' on an He 111.
Several of the gunsites received minor damage and casualties (killed and wounded) from bombs, the most serious being an oil bomb that hit an ammunition lorry.

On 15 November the Luftwaffe carried out Operation Mondscheinsonate (Moonlight Sonata) – the Coventry Blitz – the first in a new series of attacks on industrial cities.
AA Command reacted by increasing the AA cover of the West Midlands, including moving 6th HAA Rgt with 3 and 12 HAA Btys (16 x 3.7-inch mobile guns) to Wolverhampton.
The convoy set out on 24 November and the guns were deployed in their new positions by nightfall, with 3 HAA Bty at an 8-gun site H49 (Upper Penn) and 12 HAA Bty split between two 4-gun sites at H50 (Bushbury) and H51 (Wergs).
RHQ was established at Patshull Hall.
There were also searchlight sites nearby, manned by 38th (King's Regiment) S/L Rgt including ones at Bushbury and Penn Common.
15 HAA Bty joined from Grove Park on 11 December, taking over two new sites (as yet without guns) at Castle Bromwich near an important aircraft factory, with Battery HQ at Sutton Coldfield.
The regiment was now part of 34 (South Midland) AA Bde in a newly formed 11 AA Division.

Action was rare, most of the raids seen being en route to bomb Sheffield, Liverpool or Manchester.
Without guns, 15 HAA Bty was detailed to ground defence of 34 AA Bde HQ and Gun Operations Room, until two old 3-inch guns arrived for each of the battery's sites on 17 January 1941.
Shortly afterwards, 15 HAA Bty exchanged with 168 HAA Bty of 60th HAA Rgt and took over two 4-gun 3.7-inch sites near Wednesfield and Willenhall.
After 15 September the Luftwaffe concentrated on night raids – the London Blitz – which went on night after night. On 12 October, 3 HAA Bty was brought up from Cornwall to rejoin 6 HAA Rgt, taking over ZS23 and ZS26 sites, allowing 328 HAA Bty to return to its parent regiment (104th HAA Rgt). Shortly afterwards 15 HAA Bty was also brought back from Bristol, taking over sites ZW7 (Chingford) and ZE18 (Queen Elizabeth), both north of London under 4th HAA Rgt. Later 3 and 12 HAA Btys were concentrated in a 16-gun site at ZS34 (Addington). By now most of the gunsites were well equipped with 3.7-inch guns, Sperry predictors, and GL Mk I radar with an elevation finding (E/F) attachment, which slowly improved the success rate of the guns in the IAZ: on 19 November, 12 Bty scored its first 'bullseye' on an He 111. Several of the gunsites received minor damage and casualties (killed and wounded) from bombs, the most serious being an oil bomb that hit an ammunition lorry.
On 15 November the Luftwaffe carried out Operation Mondscheinsonate (Moonlight Sonata) – the Coventry Blitz – the first in a new series of attacks on industrial cities. AA Command reacted by increasing the AA cover of the West Midlands, including moving 6th HAA Rgt with 3 and 12 HAA Btys (16 x 3.7-inch mobile guns) to Wolverhampton. The convoy set out on 24 November and the guns were deployed in their new positions by nightfall, with 3 HAA Bty at an 8-gun site H49 (Upper Penn) and 12 HAA Bty split between two 4-gun sites at H50 (Bushbury) and H51 (Wergs). RHQ was established at Patshull Hall. There were also searchlight sites nearby, manned by 38th (King's Regiment) S/L Rgt including ones at Bushbury and Penn Common. 15 HAA Bty joined from Grove Park on 11 December, taking over two new sites (as yet without guns) at Castle Bromwich near an important aircraft factory, with Battery HQ at Sutton Coldfield. The regiment was now part of 34 (South Midland) AA Bde in a newly formed 11 AA Division.
Action was rare, most of the raids seen being en route to bomb Sheffield, Liverpool or Manchester. Without guns, 15 HAA Bty was detailed to ground defence of 34 AA Bde HQ and Gun Operations Room, until two old 3-inch guns arrived for each of the battery's sites on 17 January 1941. Shortly afterwards, 15 HAA Bty exchanged with 168 HAA Bty of 60th HAA Rgt and took over two 4-gun 3.7-inch sites near Wednesfield and Willenhall.
6th Heavy Anti-Aircraft Regiment, Royal Artillery