Maj-Gen Erroll Tremlett Maj-Gen Roger Reynolds Maj-Gen William Revell-Smith
Military unit
1st Anti-Aircraft Group (1 AA Group) was a formation created by the British Army's Anti-Aircraft Command in 1942 to control anti-aircraft (AA) units defending London against Luftwaffe attacks during World War II. It continued this role into the Cold War until disbandment in 1955.
1 AA Group was formed on 1 October 1942 when Lieutenant-GeneralSir Frederick 'Tim' Pile, Commander-in-Chief of Anti-Aircraft Command (AA Command), scrapped its previous conventional structure of Corps and Divisions. Each of the new AA Groups was commanded by a major-general and controlled a number of AA Brigades and support units. The new group boundaries were aligned with the Fighter Groups of the Royal Air Force (RAF).[1][2][3][4] (It was jokingly observed that a reorganisation that eliminated eight general officers was the best contribution to the war effort at the time!)[1]
1 AA Group's area of responsibility covered the London Inner Artillery Zone (IAZ) formerly controlled by 1 AA Division, and later included the 'Thames North' and 'Thames South' defences either side of the Thames Estuary from the former 6 AA Division. This tightly defined area was almost surrounded by 2 AA Group covering South East England, and together the two groups mirrored No. 11 Group RAF.[1][5]
206 Brompton Road, the former Brompton Road tube station closed in 1934, used as the headquarters of the London Inner Artillery Zone AA defences during World War II.
Order of Battle 1943–44
When they were first established there was much interchange of the units allocated to 1 and 2 AA Groups, but from early 1943 1 AA Group had the following order of battle (temporary attachments omitted):[9][10][11][12]
Z Regiments were termed 'AA Area Mixed Regiments' from April 1944, by which time they were largely operated by ATS and Home Guard personnel.[11]
Baby Blitz
The Luftwaffe carried out few bombing raids on London during 1943, preferring to concentrate on 'hit and run' attacks by Fighter-bombers against coastal targets.[18][19] However, in January 1944 it resumed night raids on London, which became known as the 'Baby Blitz'. These raids employed new faster bombers with sophisticated 'pathfinder' techniques and radar jamming. For example, on the night of 21 January 200 hostile aircraft were plotted approaching the South Coast in two waves, which intermingled with returning aircraft of RAF Bomber Command. This caused problems of identification and restrictions on fire, but the guns of 2 AA Group and then 1 AA Group engaged as the raiders approached London. Only one-fifth of the raiders reached the city, the remainder turning away to bomb open country. AA guns brought down eight aircraft and RAF Night fighters with S/L assistance also had successes. At the end of January London Docks received a 130-strong raid dropping flares and incendiaries as they had in the London Blitz of 1940–41: about one-third reached their target and five were shot down. February began with a 75-strong raid, of which only 12 reached the IAZ and four were shot down. On 13 February only six out of 115 bombers reached London. The climax came with five raids in the week 18–25 February varying from 100 to 140 in strength. These met intense AA fire from the Thames Estuary onwards and fewer than half made it to central London: the AA score was 13 shot down while the night fighters and S/Ls added 15, with another shared. Facing these casualty rates, the Luftwaffe switched to targets away from London until 24 March, when a 100-strong raid on London lost four aircraft, and finally on 18 April a raid of 125 aircraft lost 14 shot down and only 30 reached the IAZ. Although much damage was caused in London, the rising efficiency of the HAA guns and radar made the enemy's losses unsustainable.[20][21][22]
By February 1944, 1 AA Gp was responsible for the AA Operations Room at Brompton Road and the following GORs:[11]
together with a number of ordnance depots and miscellaneous establishments, including the AA Command Staff Duties School, Research Workshops and Camouflage Experimental Section, and 37 Radio Installation Detachment. In May 1944 the group was joined by 99 Group, Pioneer Corps, with 801, 809, 814, 817, 818, 841 and 844 semi-mobile smoke companies (in August 801 and 841 Companies were replaced by 4 Company, Non-Combatant Corps).[12]
Operation Diver
Ground crew prepare a V-1 for launch.
AA Command had been steadily losing men and units to the build-up of 21st Army Group for the planned Allied invasion of Europe (Operation Overlord). In April 1944, while the Baby Blitz was still under way, it was ordered to deploy much of its strength to defend the Overlord concentration areas and embarkation ports. In addition, it was preparing for the anticipated arrival of V-1 flying bombs, codenamed 'Divers'. In the event, the first of these did not arrive over England until a week after the D Day landings had begun, and AA units were able to redeploy from their Overlord sites to begin Operation Diver. However, early results of AA fire by 1 and 2 AA Groups against the small, fast, low-flying missiles were disappointing. Even shooting down those that reached the IAZ caused significant damage, so a ban was imposed on fire in this area.[23]
ATS members operating an AA identification telescope at a 3.7-inch gun site firing against V-1 flying bombs, 21 July 1944.
At the end of June Pile ordered a change in AA Command's tactics: instead of deploying mobile 3.7-inch guns in the Diver Belt, the most up-to-date power-controlled static guns, radars and predictors would be used, which involved a massive redeployment of guns uprooted from all over Britain and emplaced on temporary 'Pile Platforms'. The task was made bigger by the decision to move the Diver Belts to the coast itself, giving the guns a free fire zone out to sea. On 16 July 1 AA Group was ordered to form a 'Diver Box' of gun defences across the Thames Estuary, forward of a line from Chelmsford in Essex to Chatham, Kent. The removal of so many guns, and the silencing of those remaining in the IAZ, led Londoners to believe that the city was being defended by the RAF alone.[24]
3.7-inch HAA gun in action near London, 29 August 1944 (note AA shell bursts in the distance).
As 21st Army Group began to overrun the V-1 launching sites in Northern France, the Luftwaffe turned to launching the missiles from aircraft over the North Sea, and 1 AA Group's Diver Box was heavily engaged. It was equipped with 136 Mark IIC 3.7-inch guns with No 10 Predictors and SCR-584 radar (some manned by three US Army AA Artillery battalions), 210 Bofors guns, and two Z Batteries of mobile nine-rocket launchers manned by a converted S/L regiment. The HAA guns began using the proximity VT fuze with great success. A number of the guns were mounted on the Maunsell Forts in the Thames Estuary. In addition there were 400 20mm guns provided by the RAF Regiment and the Royal Navy. To control these guns the Box was divided into four sectors under 37, 49, 56 and 68 AA Brigades.[25]
Success rates for AA Command began to rise during this second Diver deployment: from a 9 per cent success rate in July, the average rose to over 50 per cent. On one day 68 missiles were destroyed out of 96 plotted. The weekly total of missiles reaching London fell from a peak of 362 in July to 100, then down to 10 in September. A further redeployment of guns from the South Coast through London to the East Coast was ordered on 21 September. 3 AA Group HQ was brought from Bristol to take over command of the London IAZ, and a new 9 AA Group took over East Anglia, leaving 1 AA Group to concentrate on the Diver Box and the Thames/Medway and Dover defences (though this was still a massive command temporarily controlling 10 AA brigades). The second phase of V-1 attacks ended in mid-January 1945. AA Command's success rate in this phase was impressive: out of a total of 492 V-1 targets, 320 were shot down, and only 13 reached London.[26]
Order of Battle late 1944
From mid-October 1944, 1 AA Group had the following order of battle:[12]
Static 3.7-inch HAA gun on a Pile Platform in action in Essex, 9 October 1944.
In October 1944, 1 AA Group's HQ establishment comprised 49 officers, 27 male other ranks, and 105 ATS personnel.[27] Maj-Gen Tremlett was replaced by Maj-Gen Roger Reynolds on 1 November 1944.[3][28]
Order of Battle 1945
From mid-December, when the worst of the V-1 threat to London had receded and AA Command was being forced to supply manpower to 21st Army Group fighting in NW Europe, 1 AA Group had the following reduced order of battle:[12]
26 AA Bde
119 HAA Regiment – from 9 AA Gp March 1945
135 (M) HAA Regiment – from 6 AA Gp by February 1945
153 (M) HAA Regiment
156 (M) HAA Regiment
157 (M) HAA Regiment – to 9 AA Gp by February 1945
1 AA Area Mixed Regiment – to 26 AA Bde by February 1945
19 AA Area Mixed Regiment – to 26 AA Bde by February 1945
601 GOR
1 AA Group HAA Training Centre – formed April 1945
5 Area AA Maintenance Regiment – formed April 1945
HQ 1 AA Group (M) Signal Unit
1 & 2 (M) Signal Cos
HQ 1 AA Group RASC
195, 900, 902 AA (M) Transport Cos
1 AA Group RAMC Co
1 AA Group RAOC
HQ 10 AA Workshop Bn, REME
1, 3, 15 AA Workshop Cos
37 'R' Installation Det
101, 105 Radio Maintenance Dets
AA Command Research Workshop
AA Command Physical Training Pool
AA Command Staff Duties School
AA Command School of Technical Instruction
The Home Guard was stood down in December 1944 and most of the Z Batteries were disbanded; the AA area regiments were disbanded in April 1945, becoming area maintenance units. After VE Day, 1 AA Group reverted to almost its original organisation, with 26, 28, 37 and 28 AA Bdes under command. As demobilisation progressed, some of the war-formed regiments were replaced by Regular Army units returned from overseas deployments.[12][29]
Cold War
1 AA Group was commanded in 1946–47 by Maj-Gen William Revell-Smith, who had been Major-General AA of 21st Army Group during the campaign in North West Europe.[3][30][31]
When the Regular Army and Territorial Army (TA) were reorganised for postwar needs in 1947, 1 AA Group was given responsibility for London, the Thames and Medway, Harwich and Dover.[32]
Order of Battle 1947
The 10 Year Plan for AA defence drawn up in 1947 laid down the following order of battle for 1 AA Group:[32][33][34][35][36][37]
The 1947 plan was never fully implemented, and most of the Regular units assigned to AA Command were disbanded as part of postwar demobilisation. As the Cold War developed, there was a need for new weapons, leading to the rise of Surface-to-air missiles and 'blind fire' radar control, with the consequent decline of HAA guns and searchlights. There was also political pressure for defence budget cuts. In March 1955 AA Command and its groups were disbanded and the remaining AA defence units in the UK came under control of the Home Commands and Districts.[49] 1 AA Group completed its disbandment on 31 October 1955.[5]
↑ Order of Battle of Non-Field Force Units in the United Kingdom, Part 27: AA Command, 1 October 1942, with amendments, The National Archives (TNA), Kew, file WO 212/82.
↑ Order of Battle of Non-Field Force Units in the United Kingdom, Part 27: AA Command, 13 March 1943, with amendments, TNA file WO 212/83.
1 2 3 4 Order of Battle of AA Command, 1 August 1943, with amendments, TNA file WO 212/84.
1 2 3 4 5 6 Order of Battle of AA Command, 27 April 1944, with amendments, TNA file WO 212/85.
28th Anti-Aircraft Brigade was an air defence formation of the British Territorial Army created in 1925 to command anti-aircraft units in Kent and around the militarily important Medway Towns, which it defended during the Second World War. In 1940 the brigade was responsible for the defences on the south side of the Thames Estuary including the Royal Naval Dockyard at Chatham and the Port of Dover. The brigade was heavily engaged throughout the Battle of Britain, in the summer of 1940, and The Blitz, from autumn 1940 to spring 1941, operating a total of 70 heavy anti-aircraft (HAA) guns controlled from a gun operations room (GOR) at Chatham. During 1942 many of the brigade's experienced units were transferred to active theatres overseas. Increasingly the brigade included women of the Auxiliary Territorial Service (ATS).
The 38th Light Anti-Aircraft Brigade was an air defence formation of Britain's Territorial Army formed just before the Second World War, which protected London and Southern England during the Blitz and later converted into an infantry formation for the liberation of Europe.
The 30th (Northumbrian) Anti-Aircraft Brigade was an air defence formation of Britain's Territorial Army from 1936 until 1955, which defended Tyneside and Sunderland during the Second World War.
The 32nd (Midland) Anti-Aircraft Brigade was an air defence formation of Anti-Aircraft Command in Britain's Territorial Army (TA) from 1936 to 1955, charged with defending the East Midlands of England.
The 40th Anti-Aircraft Brigade was an air defence formation of Anti-Aircraft Command in the British Territorial Army (TA) formed shortly before the outbreak of the Second World War. Its initial role was to defend Royal Air Force (RAF) airfields in East Anglia. Later it commanded part of the searchlight belt protecting The Midlands. In 1944 the brigade was moved south to protect the embarkation ports for Operation Overlord and to defend against V-1 flying bombs in Operation Diver. It was briefly reformed in the postwar TA.
The 34th Anti-Aircraft Brigade was an air defence formation of Anti-Aircraft Command in the British Territorial Army formed shortly before the outbreak of the Second World War. It defended the West Midlands of England during The Blitz.
The 33rd (Western) Anti-Aircraft Brigade was an air defence formation of Anti-Aircraft Command of the Territorial Army, part of the British Army, formed shortly before the outbreak of the Second World War. It defended Merseyside and West Lancashire during The Blitz.
35th Anti-Aircraft Brigade was an air defence formation of Anti-Aircraft Command in the British Territorial Army (TA) formed shortly before the outbreak of the Second World War. It defended the important naval base of Portsmouth during The Blitz.
The 41st (London) Anti-Aircraft Brigade was an air defence formation of Anti-Aircraft Command in the British Territorial Army, formed shortly before the outbreak of the Second World War. Its role was to defend East Anglia.
36th (Scottish) Anti-Aircraft Brigade was an air defence formation of Britain's Territorial Army, created in the period of tension before the outbreak of the Second World War. It was responsible for defending eastern Scotland.
The 37th Anti-Aircraft Brigade was an air defence formation of Britain's Territorial Army (TA) formed just before the outbreak of World War II. It was engaged in defending the Thames Estuary during the war, and continued to form part of Anti-Aircraft Command in the postwar era.
39th Anti-Aircraft Brigade was an air defence formation of Britain's Territorial Army (TA) during the Second World War. It was responsible under Anti-Aircraft Command for protecting industry along the Humber Estuary and airfields in Lincolnshire during The Blitz. Later it defended the coast of East Anglia against Luftwaffe 'hit-and-run' attacks. It was later converted to a field force formation, covered the embarkation ports for Operation Overlord and defended London against V-1 flying bombs. It served in the campaign in North West Europe, defending Antwerp against V-1s and supervising the clean-up of the notorious Bergen-Belsen concentration camp.
42nd Anti-Aircraft Brigade was an air defence formation of Britain's Territorial Army (TA). It was responsible for protecting the City of Glasgow and industry along the Firth of Clyde during the Second World War.
43rd Anti-Aircraft Brigade was an air defence formation of Britain's Territorial Army (TA). Formed in 1938, it was responsible for protecting Teesside in North East England during the early part of the Second World War, and later defended South East England from V-1 flying bombs. It was reformed postwar and survived under different titles until 1961.
6th Anti-Aircraft Brigade was an air defence formation of the British Army formed during the Second World War. It served in the disastrous Norwegian Campaign in 1940 and then defended East Anglia during the Battle of Britain and The Blitz. It was reorganised to take part in the invasion of Normandy, but instead was diverted to defending Southern England against V-1 flying bombs. It was briefly recreated in the postwar Regular Army.
44th Anti-Aircraft Brigade was an air defence formation of Britain's Territorial Army (TA). Formed in 1938, it was responsible for protecting Manchester and later the Isle of Wight during the Second World War. It was reformed postwar under a new title, and continued until 1955.
The 5th Anti-Aircraft Brigade was an air defence formation of the British Army during the Second World War. It was formed as a searchlight brigade to protect the British Expeditionary Force's bases just before the Battle of France. After the Dunkirk evacuation it was reformed as a conventional anti-aircraft (AA) brigade and served through the rest of the war in Anti-Aircraft Command, defending various parts of the United Kingdom against bombing raids and V-1 flying bombs. It continued to serve in the Regular Army during the early postwar years.
45th Anti-Aircraft Brigade was an air defence formation of Britain's Territorial Army (TA). Formed in 1938, it was responsible for protecting South Wales during the Second World War. It was reformed in the postwar TA under a new title, and continued until 1955.
52nd Light Anti-Aircraft Brigade was an air defence formation of Britain's Territorial Army (TA) during the Second World War. Formed on the outbreak of war to control static searchlight (S/L) sites in Scotland, it later operated as a headquarters (HQ) for mobile anti-aircraft (AA) gun units in the Allied invasion of North Africa and subsequent Italian Campaign.
143rd Heavy Anti-Aircraft Regiment was an air defence unit of Britain's Royal Artillery formed during World War II. It started out as a 'Mixed' regiment with around two-thirds of its personnel being women from the Auxiliary Territorial Service (ATS). The regiment defended the West of England from 1942 to the end of the war when it moved to South East England. The regiment continued in the postwar British Army.
Gen Sir Martin Farndale, History of the Royal Regiment of Artillery: The Years of Defeat: Europe and North Africa, 1939–1941, Woolwich: Royal Artillery Institution, 1988/London: Brasseys, 1996, ISBN1-85753-080-2.
J.B.M. Frederick, Lineage Book of British Land Forces 1660–1978, Vol II, Wakefield, Microform Academic, 1984, ISBN1-85117-009-X.
Joslen, H. F. (2003) [1990]. Orders of Battle: Second World War, 1939–1945. Uckfield, East Sussex: Naval and Military Press. ISBN978-1-84342-474-1.
Norman E.H. Litchfield, The Territorial Artillery 1908–1988 (Their Lineage, Uniforms and Badges), Nottingham: Sherwood Press, 1992, ISBN0-9508205-2-0.
Cliff Lord & Graham Watson, Royal Corps of Signals: Unit Histories of the Corps (1920–2001) and its Antecedents, Solihull: Helion, 2003, ISBN1-874622-92-2.
Maj-Gen R.F.H. Nalder, The Royal Corps of Signals: A History of its Antecedents and Developments (Circa 1800–1955), London: Royal Signals Institution, 1958.
Brig N.W. Routledge, History of the Royal Regiment of Artillery: Anti-Aircraft Artillery 1914–55, London: Royal Artillery Institution/Brassey's, 1994, ISBN1-85753-099-3.
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